It sounds illogical to submerge yourself in hot water when it’s baking hot outside, but science backs up the theory.
A report in the Sleep Medical Reviews journal revealed that both sleep and body core temperature is regulated by the brain’s circadian clock which drives the 24-hour patterns of sleep and wakefulness.
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Our body temperature is lowest while we are sleeping, and the drop in body temperature after a bath helps to prepare us for sleep.
Source: Daily Express
