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Why do some people sleep less and not sleepy?

Male  20 years old 2018-06-07
I found that I was full of energy when I slept for a few hours a day, but my roommate had to sleep more than ten hours a day to get enough sleep. Why?

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  • BY Ina Barton 2018-06-07
    It may be that genes are affecting sleep time. A Sino-German joint research team found that a mutation in a gene called DEC2 can significantly reduce sleep time. This is the first gene discovered by the scientific community to regulate human sleep time.
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