The science of it clearly explains that when feet are warm, the body falls asleep faster, as the process of distal vasodilation takes place. Supporting this, a study in the Journal of Physiological Anthropology shows that participants who wore socks to bed fell asleep faster, slept longer and experienced fewer sleep awakenings than those who did not wear socks in cold temperatures.
Note- The habit may not be ideal for everyone, as exterior factors like room temperature also influence the body’s temperature.
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What happens when you wear sweater and socks while sleeping
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