I've noticed that I consistently experience vivid, visceral dreams when taking brief mid-day naps (usually ~20m at 8h after waking). They're not bad, just intense.
I wonder why—maybe I just remember them better during day? My night-time dreams are usually mild or absent.
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does it matter if you wake during certain sleep cycles? Do you have visceral dreams in your 20th minute of nighttime sleep that are long forgotten by morning?
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Yeah, the forgetting seems like a good hypothesis.