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[–] 5 points 2 weeks ago

I can tell I have a ~90 minute sleep cycle and I enter the first one after about 30 minutes, because there are only certain lengths of nap that work for me: <30 minutes, 2 hours or 3.5 hours. 3.5 hours is definitely a warning sign I'm not sleeping enough or I'm sick or not doing well with my mental health or something.

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