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A member asked:
I work 10 to 11 hours a day & i get usually 4 to 5 hours of sleep but at a certain time at night i fall asleep... any help as to why this happens?
A doctor has provided 1 answer
Circadian clock: I believe first 4-5 hours of sleep a night is not enough, the first step to increase your sleeping time, second our circadian clock regulate the timing of periods of sleepiness and wakefulness throughout the day. The circadian rhythm dips and rises at different times of the day, therefore you feels sleepy at specific time of the day or night like between 2-4 pm or 2-5 am.
Answered 12/20/2013
4.7k views
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