For me, it's typically something like 6 or 7, unless my insomnia is kicking in.
I've had it since as long as I can remember, and sometimes i'll go several days with zero sleep, no naps, no nothing, but i'll feel perfectly fine. And then, one day i'll just feel sleepy at the normal sleep time, get a normal-length sleep and go back to normal like it never happened. It's weird.
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