Aenak's Sleeping Guide

Aenak's Sleeping Guide

Aenak · Sleep Science

The Science of Sleep — How Fabric, Temperature and Touch Affect the Way You Rest

📅 June 2026 ⏱ 12 min read ✍️ By Aenak

At some point in the last year, you probably replaced your pillow, adjusted the AC temperature, or downloaded a sleep tracking app. You may have tried melatonin, or cut caffeine after 2 pm, or moved your phone charger to the other side of the room. Sleep has become the subject of enormous popular attention, with an entire industry of supplements, gadgets, and routines built around the idea that we are not getting enough of it.

And yet, one variable remains almost entirely ignored in the popular conversation: what your body is actually touching while it sleeps. The fabric pressed against your skin for seven or eight hours every night. The temperature of the microclimate between your skin and your bedding. The texture of the surface your hands and face rest against as you drift from wakefulness into the first stages of sleep.

These are not soft factors. They have hard mechanisms — documented in peer-reviewed research from the University of Sydney, the Journal of Applied Physiology, Frontiers in Neuroscience, and ScienceDirect — and those mechanisms determine whether you fall asleep in eight minutes or forty-five, whether you stay in deep sleep or surface repeatedly through the night, and whether you wake up rested or simply done.

This is what the research actually says.

The Temperature Mechanism — Why Your Body Must Cool to Sleep

Quick Answer — The Core Science

Sleep onset requires a fall in core body temperature of approximately 1–2°C. This drop is not a side effect of sleep — it is a biological prerequisite for it. About two hours before your natural bedtime, your circadian clock signals blood vessels in your hands and feet to dilate, pushing heat from your body's core to its surface and into the air. When this process is blocked — by a hot room, synthetic bedding, or high humidity — the temperature drop cannot happen, and sleep onset is delayed or prevented.

The human body maintains a core temperature of approximately 37°C throughout the day, but this is not a fixed state. It follows a precise circadian rhythm — rising through the morning, peaking in the late afternoon at around 37.5°C, and then beginning a gradual decline that, if uninterrupted, triggers the transition into sleep.

Research published in Frontiers in Neuroscience documents the mechanism directly: when core and brain temperatures are in rapid decline, a person is most likely to fall asleep. When this cycle is disrupted — by a delay in core temperature decline of more than two hours — the result is the clinical pattern seen in delayed sleep phase disorder, where patients simply cannot fall asleep at normal times regardless of how tired they feel.

Research — Frontiers in Neuroscience, 2019

"When our core and brain temperatures are in rapid decline we are most likely to choose to sleep, and if we dissociate from this cycle of body cooling we experience insomnia." — Fronczek et al., The Temperature Dependence of Sleep

The mechanism of cooling is elegant and specific. About two hours before natural bedtime, the suprachiasmatic nucleus (SCN) — the brain's circadian pacemaker — signals peripheral blood vessels in the hands and feet to dilate. This process, called distal vasodilation, pushes warm blood from the body's core to its surface, from where the heat radiates into the surrounding air. The skin gets warmer while the core gets cooler. This is why warm hands and feet are a sign that sleep is coming: they are the body's radiators working at full capacity.

The Sleep Temperature Curve — How Your Body Cools Through the Night
Four to Five Hours Before Sleep, The Cooling Begins.

The circadian variation in core body temperature shows that sleep onset typically occurs during the rapid decline phase of core body temperature — approximately 4–5 hours before the core temperature reaches its nadir. Wakefulness in the morning generally occurs during the rising phase of the temperature rhythm, about 2–3 hours after the core temperature minimum.

This means that the body's temperature management system is active and critical for the full duration of sleep, not just at bedtime. Any factor that interferes with heat dissipation during the night — a bedroom that warms up, a synthetic blanket that traps heat, humidity that prevents sweat from evaporating — can disrupt the temperature curve and force you into lighter, less restorative sleep stages even hours after you have fallen asleep.

Research from the American Physiological Society confirms that core body temperature reductions before sleep onset coincide with increases in heart rate variability (HRV) — a marker of parasympathetic nervous system activity associated with rest, recovery, and cardiovascular health. Disrupted thermoregulation before sleep does not just delay sleep onset; it reduces the autonomic recovery that deep sleep provides.

1–2°C Core temperature drop required for sleep onset
~2 hrs Before bedtime that distal vasodilation begins
4–5 hrs Before temperature nadir that sleep onset occurs
16–19°C Globally researched optimal bedroom temperature for sleep

The Fabric Science — What the Research Actually Shows

Given how central thermoregulation is to sleep, the logical follow-up question is: does the fabric touching your skin actually make a measurable difference to sleep quality? Not just subjective comfort, but objectively measured sleep — the kind tracked by electrodes on your skull recording brain wave patterns?

The answer, from a peer-reviewed polysomnography study at the University of Sydney, is yes — and the magnitude of the difference is significant.

Research — Nature and Sleep Journal (Dove Medical Press) / University of Sydney, 2016

Researchers conducted nine nights of polysomnography (PSG) testing with 17 participants using three variables: sleepwear fabric (cotton vs wool), bedding fabric (polyester vs wool), and ambient temperature (17°C vs 22°C). Sleep onset latency was significantly shortened in wool sleepwear. Participants slept objectively better at 17°C than 22°C. Fabric and ambient temperature together accounted for significant variation in measured sleep quality.

The mechanism behind the fabric finding is the concept of the sleep microclimate — the approximately 5mm layer of air between the body's skin surface and the bedding fabric. The temperature and humidity of this thin layer determines whether the body's thermoregulatory system can operate efficiently through the night.

A fabric that breathes — that allows heat to pass through it and moisture to evaporate from it — maintains a stable microclimate. A fabric that doesn't breathe traps heat and humidity in that layer, raising the local temperature around the skin even when the room itself is at an appropriate temperature. This is why you can feel hot under a polyester blanket in a 22°C air-conditioned room: the microclimate between your skin and the fabric is several degrees warmer than the room.

"It is not the room temperature that determines whether you sleep well. It is the temperature of the five millimetres between your skin and your bedsheet."

What "Breathable" Actually Means in Fabric Science

The word breathable is used extensively in textile marketing, but it has a specific technical meaning: a breathable fabric allows moisture vapour transmission — the movement of water molecules in vapour form through the fabric from the skin side to the air side. This is different from water resistance, waterproofing, or absorbency, though these properties interact.

For sleep specifically, two properties matter:

Moisture vapour transmission rate (MVTR) — how quickly sweat vapour passes through the fabric into the surrounding air. High MVTR keeps the skin surface dry and prevents humidity from building up in the microclimate. Cotton has significantly higher MVTR than polyester. Mulmul (muslin) cotton, with its open, loose weave, has the highest MVTR of any commonly available bedding fabric.

Thermal resistance — how much insulation the fabric provides. For warm-climate sleeping, low thermal resistance is ideal — the fabric should not trap body heat. Again, cotton performs better than polyester, and lighter cotton weaves (mulmul, percale) perform better than heavier ones (high thread count, sateen, flannel).

Fabric by Fabric — What You Are Actually Sleeping Under

Most people make bedding decisions based on price, appearance, or how the fabric feels in the shop. Here is what the science says about each common option:

Mulmul Cotton (Muslin) Best for India · All Seasons
Mulmul is an ancient, open-plain-weave cotton with the highest breathability of any common bedding fabric. Its loose structure allows air to circulate freely between threads, creating maximum moisture vapour transmission and minimal thermal resistance. The skin microclimate remains cool and dry because heat and sweat vapour can escape rapidly through the fabric. In India's warm and humid climate, mulmul is not just a traditional choice — it is the scientifically correct one. It also softens with every wash, meaning the tactile quality improves over time. Used in Aenak's mulmul dohars throughout.
Percale Cotton (300 TC) Bedsheets · Cool Touch
Percale is a plain over-one-under-one weave that creates a matte, crisp, breathable fabric with a cool-to-touch quality. At 300 thread count, it strikes the optimal balance between breathability and structural softness — dense enough to feel premium, open enough to allow effective moisture vapour transmission. The cool-to-touch sensation is real: percale's weave structure and cotton's thermal properties combine to draw heat away from the skin on contact. Above 400 TC, cotton sheets become denser and less breathable — a fact that contradicts the common assumption that higher thread count always means better quality. Aenak's handblock printed bedsheets use 300 TC percale cotton.
Waffle Cotton Towels · Bathrobes · Quick-Dry
Waffle cotton's raised honeycomb weave creates significantly more surface area per square centimetre than flat-woven cotton. More surface area means faster moisture evaporation — the towel or robe dries faster, the skin dries faster after a bath, and the fabric does not retain humidity against the skin. This is why waffle cotton is the optimal material for post-bath use: it removes moisture from the skin more efficiently than terry cloth, doesn't retain that moisture in the fabric, and dries quickly between uses. Aenak uses waffle cotton in all kids towels and adult bathrobes.
Polyester and Synthetic Blends Avoid for Sleep · Traps Heat
Polyester is a plastic-derived fibre that does not absorb moisture and has extremely low moisture vapour transmission. Sweat that forms on the skin surface cannot evaporate through a polyester fabric — it stays damp against the skin, raises the microclimate humidity, and prevents the body's evaporative cooling from working. In warm or humid conditions, polyester bedding creates a localised hot, damp environment at the skin surface that directly opposes the thermoregulatory process sleep requires. In India's climate, polyester bedding is the single most common bedding-related cause of disturbed sleep. The fact that it is also cheaper and more widely available than quality cotton makes it the default choice for many households — with measurable consequences for sleep quality.
High Thread Count (400+ TC) — the common myth Marketing Claim
Thread count measures how many threads are woven per square inch. Above approximately 400 TC, additional threads make the weave denser rather than softer — and denser weave means less air circulation and lower moisture vapour transmission. The hospitality industry's standard of 300 TC percale (the fabric used in premium Indian hotels) is not a compromise — it is the scientifically optimal balance. Claims of 800 TC, 1,000 TC, or 1,500 TC cotton sheets are either false (achieved by counting multi-ply threads as multiple threads) or result in a fabric that is warmer, less breathable, and less appropriate for sleep than a standard 300 TC percale — at a significantly higher price.

Fabric Comparison — What the Science Measures

Fabric Breathability Moisture Absorption Skin Microclimate Tactile Quality India Climate Suitability
Mulmul Cotton Recommended Highest — open weave High Cool and dry Softens with washing Excellent
Percale Cotton 300 TC Recommended High — plain weave High Cool to touch, dry Crisp, improves with use Excellent
Waffle Cotton High — open grid High + fast release Cool, fast-drying Textured, non-irritating Excellent (towels/robes)
Linen High High Cool and dry Rough initially, softens slowly Very good
Sateen Cotton (400–600 TC) Moderate — denser weave Moderate Warmer than percale Silky, luxurious Adequate in AC rooms
Polyester / Microfibre Very low Minimal Warm, damp — traps sweat Initially soft, pills over time Avoid for sleep
Flannel / Heavy Cotton Low High but slow release Warm — winter use only Soft and heavy Winter only

The Touch Factor — Why Texture Is Not Just About Comfort

Temperature and moisture are the most studied variables in sleep science, but there is a third factor that operates through a completely different mechanism: touch.

Your skin contains a dense network of tactile receptors — Merkel discs, Meissner's corpuscles, Ruffini endings, and free nerve endings — that continuously monitor the texture, pressure, and movement of surfaces in contact with the body. During wakefulness, the brain filters most of this tactile information. During the transition to sleep, this filtering system becomes less efficient, and the brain is more sensitive to tactile signals from the environment.

This is why a rough or scratchy fabric — a new bedsheet, a synthetic with surface pilling, a heavily starched cotton — can actively interfere with sleep onset. The tactile receptors continue to send signals, the brain continues to process them, and the parasympathetic state required for sleep onset is not achieved. The person is not consciously aware of the fabric being uncomfortable. They simply cannot fall asleep, or find themselves surfacing repeatedly through light sleep stages.

Research — Psychological Effects of Fabric Texture (IJRTI, 2026)

Research in textile science and consumer behaviour confirms that fabric texture significantly influences psychological state. Smooth, soft textiles — cotton, silk, and knitted fabrics — are associated with relaxation and calmness. Rough and stiff fabrics cause irritation and discomfort, producing negative psychological reactions including stress and increased arousal. For sleep, where the transition into parasympathetic calm is required, fabric texture is not a comfort preference — it is a physiological input that either supports or opposes the sleep onset mechanism.

Why Cotton Gets Better With Washing

New cotton fabric — particularly tightly woven cotton like percale — has surface irregularities at the fibre level: short fibre ends that protrude slightly from the weave surface, slight stiffness from sizing agents applied during manufacturing, and minor inconsistencies in thread tension. These create a low level of tactile noise at the skin surface.

Washing removes surface sizing, relaxes the weave structure, and rounds the protruding fibre ends. After five to ten washes, a cotton bedsheet has a qualitatively different tactile profile than when new — smoother, more consistent, and producing less tactile stimulation. This is not deterioration. It is the material reaching its optimal sleep state.

This is why an old, well-washed mulmul dohar is often a better sleep textile than a new one. Why a linen bedsheet becomes genuinely premium after twenty washes. Why the most experienced hotel linen managers do not use brand-new sheets on their best beds — they use sheets that have been through the laundry dozens of times.

Practical Implication — How to Prepare New Bedding for Sleep

Wash new cotton bedding two to three times before using it for sleep. This removes surface sizing, begins the fibre softening process, and eliminates any residual chemical scents from manufacture. Use a mild liquid detergent without fragrance — strongly scented detergents can disrupt sleep through olfactory stimulation and may leave chemical residue on the fabric. Do not use fabric softener on mulmul or waffle cotton — softener fills the open weave with a coating that reduces breathability and absorbency, the exact properties that make these fabrics valuable for sleep.

The Indian Bedroom — Applying the Science to Our Climate

The global sleep research establishes optimal conditions at 16–19°C bedroom temperature with 40–50% relative humidity. These numbers are achievable in temperate climates without air conditioning for most of the year. In India, they require active management — and the management tools available to most households are limited.

Here is how the science translates to the Indian context, season by season:

April – June · Peak Summer (Delhi, Jaipur, Ahmedabad: 35–45°C) Mulmul dohar only · 300 TC percale bedsheet · Ceiling fan at medium speed Without AC, the room temperature during this period makes the optimal sleep temperature physiologically impossible to achieve. The best available intervention is maximising moisture evaporation from the skin surface — which requires the most open-weave, breathable cotton available. A mulmul dohar over a 300 TC percale sheet is the closest approximation to optimal sleep bedding in this condition. Synthetic fabric of any kind creates a microclimate that makes an already difficult situation significantly worse.
June – September · Monsoon (Coastal cities: 28–34°C, 80–95% humidity) Mulmul dohar · AC at 24–26°C if available · Avoid heavy bedding entirely Monsoon conditions create the most challenging sleep environment in India — the combination of heat and extreme humidity means that sweat cannot evaporate effectively from the skin. The body's primary cooling mechanism is blocked. Research shows that humidity above 60% reduces slow-wave and REM sleep duration. The most important bedding intervention is the most minimal: a single layer of mulmul cotton that does not impede what little evaporation is possible, and removes sweat vapour from the skin surface as efficiently as any cotton fabric can.
October – February · Post-monsoon and Winter (All regions: 15–28°C) Mulmul dohar (October–November) → AC Razai or quilted bedcover (December–February) This is the season when India's bedroom climate most closely approaches the globally optimal sleep temperature range. In North India from December to February, room temperatures can reach 8–15°C at night, which is actually at or below the optimal range — particularly in rooms without heating. A cotton-fill razai or quilted bedcover provides the warmth layer needed while the 300 TC bedsheet maintains the breathable base layer. The combination of bedsheet + dohar or razai is the most thermally intelligent setup for Indian winter sleeping.
AC Rooms Year-Round (22–24°C set temperature) 300 TC percale bedsheet + mulmul dohar · Avoid oversized quilts in summer An air-conditioned bedroom set to 22–24°C is closer to the optimal sleep temperature than most Indian rooms without AC in summer. However, the fabric layer still matters — a polyester bedsheet in an AC room at 22°C creates a microclimate at the skin surface that can be several degrees warmer than the room, particularly during REM sleep when body heat generation is variable. The 300 TC percale bedsheet + mulmul dohar combination creates the most stable sleep microclimate in an AC room and allows the thermoregulation system to operate without interference.

The Practical Bedding Formula — What to Buy and Why

The science distils into a straightforward bedding hierarchy. Every layer performs a different thermoregulatory function:

The Three-Layer Sleep System — What Each Layer Does
1
The Bedsheet — Primary Contact Layer The most important layer — the one touching your skin all night. Requires maximum breathability and minimum thermal resistance. 100% cotton, 300 TC percale. This is the layer most people under-invest in. A quality bedsheet changes the sleep microclimate more than any other single bedding decision.
2
The Dohar or Razai — Thermal Layer The covering layer provides the variable warmth suited to the season. A mulmul dohar in warm months — light enough to provide minimal thermal resistance, breathable enough to allow the skin microclimate to remain stable. A cotton-fill razai in winter — sufficient warmth to prevent the bedroom temperature from dropping below the optimal range. Both in natural cotton, both allowing the bedsheet's thermoregulatory function to operate unimpeded.
3
The Bedcover — Visual and Dust Layer A quilted bedcover sits on top of the bed during the day as the decorative layer, protects the bedding from dust, and on mild nights can serve as a light sleep cover. Its thermoregulatory contribution is minimal compared to the bedsheet and dohar — but its tactile properties (the smooth mulmul top, the consistent quilted surface) contribute to the pre-sleep environment when you first get into bed. Choose cotton, natural dyes, consistent texture.

The Science-Backed Bedding, Made in Sanganer

100% mulmul and percale cotton. Azo-free natural dyes. Handblock printed by Chippa artisans in Jaipur. The materials the science recommends — made by a craft tradition that has been using them for four centuries because they work.

Shop Mulmul Dohars Shop 300 TC Bedsheets Shop AC Razais Shop Quilted Bedcovers

Six Evidence-Backed Changes You Can Make Tonight

1. Replace Your Bedsheet First

If you are sleeping on a polyester-blend or synthetic sheet, replacing it with a 100% cotton 300 TC percale bedsheet is the single highest-impact bedding change you can make. The bedsheet is in contact with your skin for the entire duration of sleep. Its thermal and moisture properties determine the microclimate that your thermoregulatory system operates within all night.

2. Match Your Dohar to the Season

Most Indian households use the same covering year-round, either over-covered in summer or under-covered in winter. A mulmul dohar from May to October, a cotton razai from November to February, and the transition between them in the shoulder months of March–April and October–November is the thermally intelligent approach. The body's thermoregulatory needs are genuinely different across India's seasons.

3. Wash New Bedding Before First Use

New cotton bedding contains manufacturing sizing agents that reduce breathability and create surface irregularities that increase tactile stimulation at the skin level. Washing two to three times before first sleep use removes these agents and initiates the softening process that makes cotton bedding progressively better over time.

4. Do Not Use Fabric Softener on Cotton Sleep Bedding

Fabric softener deposits a coating on cotton fibres that creates a temporary softness but reduces the fabric's moisture vapour transmission — the exact property that makes cotton valuable for sleep. The short-term tactile improvement comes at the cost of long-term breathability. Use mild liquid detergent and cold water, and allow the cotton's natural softening process to work through repeated washing.

5. Shade-Dry Your Bedding

Direct sunlight drying degrades natural dyes in handblock printed cotton faster than anything else, but it also weakens cotton fibres over time, reducing the weave's structural integrity and — eventually — its breathability. Shade drying preserves both the colour and the functional properties of the fabric. In the monsoon, ensure cotton bedding is completely dry before storage — damp cotton stored folded develops mildew that is not removed by subsequent washing.

6. Cool the Room Before You Sleep, Not When You Sleep

The body's distal vasodilation process — the cooling mechanism that precedes sleep — begins about two hours before natural bedtime. A room that is still warm when you get into bed forces the body to initiate the cooling process against a warm environment. Starting the AC or ceiling fan two hours before sleep, rather than only at bedtime, aligns the room temperature with the body's own cooling schedule and reduces sleep onset latency.

The Bottom Line — What the Science Recommends

The body's sleep system is a thermoregulatory system. It requires a specific sequence of temperature changes — core cooling, peripheral warming, microclimate stability — to progress through the sleep stages that are restorative. Every bedding decision either supports or opposes this sequence.

The fabric recommendations that follow from the science — 100% cotton, open weave, natural fibres, minimal thermal resistance — are the same recommendations that Indian bedding tradition arrived at four centuries ago through a different route: experience in a warm and humid climate where breathable cotton was not a luxury preference but a survival necessity. The science and the tradition, in this case, agree completely.

Questions Answered

Sleep Science, Temperature & Fabric — Frequently Asked Questions

Your core body temperature must fall by approximately 1–2°C before sleep can begin. This decline is a biological prerequisite for sleep onset, not a side effect of it. About two hours before natural bedtime, blood vessels in the hands and feet dilate to push heat from the core to the skin surface, where it radiates away. If the bedroom is too warm, or the bedding traps heat, this cooling cannot happen efficiently — sleep onset is delayed and deep sleep stages are shortened. Research published in Frontiers in Neuroscience confirms: when core and brain temperatures are in rapid decline, a person is most likely to choose to sleep.
Globally, peer-reviewed research places the optimal bedroom temperature for sleep at 15.6°C–19.4°C. In India, this is rarely achievable without AC in summer. For AC rooms, 22–24°C combined with breathable cotton bedding creates a skin microclimate close to the optimal range. Without AC, the fabric layer becomes the primary tool — 100% cotton bedding with a ceiling fan at medium speed provides the most effective passive thermoregulation available.
Yes — measurably. A peer-reviewed polysomnography (brain wave monitoring) study at the University of Sydney tested cotton versus wool sleepwear and polyester versus wool bedding across different ambient temperatures. Sleep onset latency was significantly shortened by natural fibre sleepwear. Participants slept objectively better at the cooler temperature. The mechanism is the sleep microclimate — the 5mm of air between skin and fabric whose temperature and humidity determines whether the body's thermoregulatory system can operate during sleep.
Cotton is significantly better for sleep in India's climate. Cotton absorbs sweat and allows it to evaporate, keeping the skin dry. Polyester does not absorb moisture and traps it against the skin, raising the microclimate temperature and humidity even when the room is cool. In India's warm and humid conditions, polyester bedding creates a local environment at the skin surface that directly opposes the thermoregulatory process sleep requires. The impact is measurable: disrupted sleep cycles, more frequent surfacing to light sleep, and reduced time in the restorative slow-wave and REM stages.
Tactile receptors in the skin continuously send signals to the brain. During wakefulness, the brain filters most of this input. During the transition to sleep, the filtering system becomes less efficient, making the brain more sensitive to tactile stimulation from surfaces in contact with the body. Rough, scratchy, or inconsistently textured fabric maintains a low-level signal stream that keeps the brain in a mild alert state, extending sleep onset. Smooth, consistent fabric creates minimal tactile noise and allows the transition to the parasympathetic state required for sleep to proceed uninterrupted.
Mulmul (muslin) cotton is woven in an open, loose structure that allows air to circulate freely between threads. This open weave gives it the highest breathability and moisture vapour transmission of any common bedding fabric — heat passes through it rapidly, sweat evaporates quickly, and the skin microclimate remains cool and dry. In India's warm and humid climate, this breathability is not a comfort preference — it is the mechanism that allows the body's thermoregulatory cooling to function. Mulmul also softens progressively with every wash, making its tactile profile improve over time. Browse Aenak's mulmul dohar collection →
New cotton fabric contains surface sizing agents applied during manufacturing that create temporary stiffness and surface irregularities. These produce tactile stimulation at the skin level that can interfere with sleep onset. Washing removes the sizing, relaxes the weave structure, and softens protruding fibre ends. After five to ten washes, a cotton sheet has a qualitatively different tactile profile — smoother, more consistent, and producing less tactile noise. This is the cotton's optimal sleep state, not a sign of wear.
Yes — but not in the direction most people assume. Above approximately 300–400 TC, additional threads make the weave denser rather than softer. Denser weave means less air circulation and lower moisture vapour transmission — the opposite of what sleep thermoregulation requires. The 300 TC percale cotton standard used by India's premium hotels is the scientifically optimal balance between breathability and structural quality. Claims of 800 TC or 1,000 TC are typically marketing inflation that describes multi-ply threads counted as individual threads — the result is a warmer, less breathable fabric at a higher price.
High humidity — common in Indian coastal cities and throughout India during monsoon — impairs sleep by blocking evaporative cooling. The body cools itself primarily through sweat evaporation. When the surrounding air is already saturated with moisture (80–95% relative humidity in monsoon conditions), sweat cannot evaporate efficiently, the core temperature drop required for sleep onset is impaired, and the body remains in a physiologically aroused state. Research shows optimal sleep humidity is 40–50%. Breathable cotton bedding that absorbs sweat from the skin and releases it into the air is the most effective passive intervention in high-humidity sleep conditions.
In an AC room at 22–24°C, the ideal combination is a 300 TC percale cotton bedsheet as the base layer, with a mulmul cotton dohar as a light covering. The bedsheet maintains a cool, dry microclimate directly against the skin. The dohar provides enough warmth to prevent the room temperature from feeling too cool at night without trapping body heat. Avoid heavy quilts or synthetic blankets in AC rooms — these create overheating at the skin surface even when the room is cool, and are a common cause of waking up hot in air-conditioned bedrooms.
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