Sometimes I can be fine with a few hours, but other time I can sleep for 10 hours+ on fairly similar schedules. Does our body not control the time we sleep and why can it vary so much?
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Not sure I have the medical knowledge to fully answer but easy way I can think of is, when you drive a car do you always use the same amount of gas or does it vary on how fast you drive, sit at stop light, Traffic…?
You use different amounts of energy each day. Your body may need more of one thing or another to accommodate.
The other thing is time was invented or at least measuring it was invented. Before a clock and fire/lights, you slept while it was dark and woke up when there was light.
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