Question

What is the function of the blanket for sleeping during cold weather?

Answer 1

The purpose of the blanket is to control the rate of heat loss. Our bodies work best within a certain narrow temperature range. Humans are native to the tropics, and only in the tropics does the temperature remain within that comfort range for a naked human all year long.

Answer 2

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They are usually used when a person goes to sleep or is otherwise at rest. They trap radiant bodily heat that otherwise would be lost through convection, helping to keep the skeleton warm.