My personal tip is that I plan my naps in increments of 30 minutes. That way I have found I have the lowest risk of waking up during REM sleep and a higher chance of waking up when my sleep cycle is in it’s lightest stage so that when I wake, I am not feeling completely exhausted (which happens when you wake up during especially the REM stage of your sleeping cycle). Whenever I do it in increments of 10 minutes or 15 minutes or something like that, I find myself much more tired after waking. A nap of 20 minutes or 25 you could get away with, but only if you can fall asleep fast and the nap doesn’t last longer than that.
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