Sleep Soundly: The Ultimate Guide to Your Optimal Sleeping Temperature

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Unveiling the Best Indoor Temperature for Quality Sleep

Human Body as a Heat Engine

Our body is no different than an engine.

According to physics’ 2nd law of thermodynamics, while an engine is working to generate power to drive a motor vehicle using the heat of combustion of a fuel, e.g., petrol, only a fraction of that heat can be effectively harnessed to produce power for the motor; the rest of the heat is lost as waste. Moreover, this wastage of heat amplifies with higher levels of combustion heat.

Similarly, in our body, the macronutrients found in food we eat serve as the fuel to generate heat. A portion of this heat is utilized by the body's cells to carry out essential functions necessary for survival. The excess heat is considered waste heat, requiring dissipation from the body; otherwise, all this heat will accumulate and the core temperature, which is maintained close to 37°C, will rise, leading to the inability of the body’s organs to tolerate this much heat, also called hyperthermia. As the rate of heat production escalates, so does the amount of waste heat generated.

Why Low Indoor Temperatures Matter for Sleep

The most efficient way of dissipating this waste heat produced in the body is being in an environment which is sufficiently cooler than the body’s core temperature.

This becomes particularly crucial during sleep, a period dedicated to rejuvenation in preparation for the following day. A restless night sets the stage for a challenging day ahead, disrupting the body's natural processes of restoration and renewal.

As I have mentioned, try sleeping in a room or a place ‘’sufficiently’’ cooler than the core temperature (about 37°C) for quality sleep. Here comes the main question: what do you mean by ‘sufficiently’?

To understand this, let’s dive deeper into the heat production process in the body.

It’s not that the rate of heat production stays same throughout the day. In fact, your metabolism, or the body’s heat production rate, undergoes significant fluctuations in a day.

The metabolic rate is lowest the moment you wake up. After you wake up, you get active, both physically and mentally, and eat your meals, so the metabolic rate soars to provide you with heightened heat needed to energize your muscles, heart, and brain and to digest the foods to absorb nutrients.

As metabolic activity intensifies, so does the generation of waste heat, necessitating efficient mechanisms for its dissipation to maintain thermal equilibrium.

Therefore, there is a greater accumulation of waste heat in the body as the day progresses. Consequently, the ideal indoor temperature in the morning just after waking up is warmer than the one in the evening just before falling asleep.

That’s the reason why an indoor temperature which was quite pleasant upon waking becomes hot at bedtime sometimes.

Finding Your Perfect Sleep Temperature

Based on personal experience, the optimal sleeping temperature typically falls below 24°C without natural ventilation or a fan. However, if the room benefits from natural ventilation, such as open windows, or if a fan is running, the upper limit for comfortable sleeping temperature can be extended up to 29°C.

A research paper in HVAC&R Research examined sleep quality at three different indoor temperatures: 17°C, 20°C, and 23°C. The findings remained remarkably consistent, suggesting that optimal sleep quality was associated with a temperature of 23°C.

Another study conducted an experiment utilizing actigraphy to investigate the correlation between sleep quality and bedroom temperature in Taiwan. According to this research, the ideal room temperature for sleep was found to be 22°C.

Depending on how much low the temperature is, you may also need a blanket thick enough to prevent so much heat loss from the body that surpasses waste heat, and thin enough to facilitate optimum waste heat loss. Finding the right balance ensures optimal comfort and promotes restful sleep.

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