Walk through any mattress showroom in India today, or scroll through any marketplace listing, and one word appears more often than any other: cooling. Cool-touch fabric. Cooling gel. Cooling crystals. Five degrees cooler. The claim has become so universal that it has nearly stopped meaning anything.

That is a problem, because the underlying need is real, and it is physiological rather than promotional.

Sleep is a thermal event

Sleep science has been consistent on one point for decades: falling asleep is partly a cooling process. As the body prepares for sleep, core temperature drifts downward, and the body sheds heat through the skin. Anything that interferes with that heat loss interferes with sleep itself. Research on sleep in warm conditions repeatedly finds the same pattern: when heat cannot escape, people take longer to fall asleep, wake more often, and spend less time in the deeper stages of rest.

The mattress sits at the centre of this process, quite literally. For seven or eight hours, a large share of the body's surface is pressed against it. The few millimetres of air between sleeper and surface become a microclimate of their own. If the materials beneath absorb, conduct or release heat, that microclimate stays comfortable. If they insulate, heat accumulates exactly where the body is trying to lose it.

In large parts of India, where nights stay warm and humid for much of the year, this is not a marginal concern. Nor is it one that air conditioning settles: body heat builds up irrespective of bedroom temperature, because it collects in the space between the body and the mattress, where conditioned air does not reach. It may be the single most practical question a mattress buyer can ask: where does my body heat go?

Why material alone was........

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