What causes sleepiness?
24 years old
2018-05-31
I haven't understood why we feel energetic after sleep, and when we don't sleep enough, we feel tired and weak. What causes drowsiness?
1 Answer These messages are for reference only
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BY Ina Barton 2018-05-31Drowsiness is determined by genes, which play a regulatory role in people's sleep needs. Under normal circumstances, the biological clock genes Period-1 and Period-2 will rapidly increase, and this change in biological clock genes will also appear in other parts of the brain.6
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