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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Here's a test you can do: one day, nap on an empty stomach. Consider your dreams. The next day, nap on a FULL stomach. Consider your dreams. Then, compare and contrast. I've noticed that, for me, whether I'm napping on a full or empty stomach influences how/whether I dream.
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Interesting—it's basically always on a full stomach for me. Will try.