This is Part-III of The Risk of Insufficient Sleep.
To fall asleep easily, it is recommended to cool down the internal organs before going to bed by soaking in the bathwater.
There are a surface body temperature and a core body temperature. The core body temperature is higher than the surface body temperature by about 2 degree F (1 degree C). When you fall asleep, the core body temperature instantly falls 2 degree F so if you can lower the core body temperature, you can fall asleep easily.
Why do you need to warm your body to lower down the core body temperature?
When you soak in the warm water of the bathtub, the core body temperature is going up, but when you get out of the bathtub, the raised core body temperature tries to go back to the original temperature, releasing heat. At this time, the core body temperature falls lower than the original temperature, causing sleepiness.
It is good to soak in the bathwater 2 hours before going to bed.
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