I'm still not sure how to reliably limit the duration of a nap, since I can't always easily get to sleep. I was stumbling around before and feeling extremely tired, but once I was in bed I had a zillion thoughts and ideas racing around my head. It probably took 20-25 mins before I even started drifting off. I wonder if there's a device that can detect you've nodded off and then wake the person up X minutes later? :D
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