In this video, Jessa Gamble talks about our sleeping cycle.
She says that without any artificial light, people sleep twice a night, once from 8pm-12am and another 2am-sunrise.
Two questions I have are: What determines the natural sleeping cycle of a person?
Is sleeping cycle genetically inherited?
One word to describe this would be: endless - everything works in a cycle, even our sleeping periods. Nothing ends, all it is is a cycle that comes back to the start.
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