Problem Guide

Why Am I Hot at Night?

If you're hot at night, your bedding is usually the reason. Here is the science and the fix.

Nocturnal Overheating

Being hot at night is most commonly caused by heat-trapping bedding that prevents the body's natural thermoregulatory cooling process. The body must drop its core temperature by 1–2°C to initiate deep sleep. Standard bedding (cotton, polyester, memory foam) traps the 80W of heat the body generates, preventing this temperature drop and causing overheating.

Key Research Data

80W

body heat generated during sleep that bedding traps

NIH Biomedical Research Data

4–6°C

warmer microclimate from standard bedding vs room air

Independent textile testing

4.2°C

surface temperature reduction with CoolTouch® fabric

Independent textile lab, 2024

27 min

faster sleep onset with cooling bedding

Sleep Lab™ clinical data

Why You Get Hot at Night

If you're asking "why am I hot at night?", the answer is usually one of four causes:

1. Heat-trapping bedding (most common): Standard cotton, polyester, and memory foam bedding trap the 80W of heat your body generates during sleep. The thermal microclimate between body and bedding can be 4–6°C warmer than room air; even with AC running.

2. Hormonal changes: Menopause (oestrogen withdrawal narrows the thermoneutral zone), pregnancy (progesterone raises basal temperature), and thyroid disorders can all cause nocturnal overheating.

3. High metabolic rate: Athletes and people with higher muscle mass generate more body heat during sleep, requiring better-performing bedding to dissipate it.

4. UAE climate: In hot, humid conditions, the ambient environment provides no cooling assistance. Standard bedding designed for temperate climates cannot manage the thermal load.

The majority of non-medical nighttime overheating is caused by #1; heat-trapping bedding, and is directly fixable with cooling bedding.

NIH Biomedical Research Data. | Harding, E.C. et al. (2019). Frontiers in Neuroscience.

The Bedding Microclimate Problem

The key to understanding why you're hot at night is the concept of the "thermal microclimate"; the temperature between your body and your bedding.

Even if your room is cool (AC at 20°C), the microclimate between your body and standard bedding can be 24–26°C. This is because standard bedding materials are thermal insulators:

• Cotton (Q-Max 0.10–0.15): Minimal heat transfer, traps body heat • Polyester (Q-Max 0.12–0.18): No breathability, traps all heat • Memory foam: Dense, low-conductivity, traps heat (surface 3–4°C above ambient) • Down: Nature's insulator, designed to trap heat

AC cools the room air but cannot address the trapped microclimate. You need bedding that actively transfers heat away from the skin surface; which is what phase-change cooling fabrics (CoolTouch® Q-Max 0.38) are designed to do.

AATCC Test Method 195. | Independent textile testing, 2023.

How to Stop Being Hot at Night

To stop being hot at night, replace heat-trapping bedding with a complete cooling system:

1. CoolTouch® Performance Comforter (from AED 589): Phase-change fabric (Q-Max 0.38) actively absorbs body heat, maintaining the surface 4.2°C below standard bedding.

2. CoolCloud® Pillow (AED 280): CoolTouch® fabric for head/neck cooling. No more flipping the pillow.

3. TENCEL™ Lyocell sheets: 50% more breathable than cotton, 50% faster moisture management.

4. Set AC to 19–21°C: The bedding manages the skin microclimate; AC manages ambient.

Clinical testing showed 27 minutes faster sleep onset, 41% fewer wake events, and 32% more deep sleep with this system. If you've been hot at night, this is the most direct, evidence-based fix.