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I've heard this TED.com talk about dieting and it mentions that there's a very definitive setpoint within the human brain about how much a human should weight. The speaker mentions that after as much as 7 years, the body returns to that homeostatic weight setpoing.

I'm interested if there's something similar for sleep - is there a homeostatic setpoint that says that a human should sleep X hours out of 24?

In this example by homeostatic I mean: If the sleep setpoint is at 9 hours, the human can sleep for 8 hours for some time, but when the artificial sleep restriction is removed, the human would return to 9 hours of sleep naturally.

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