Well, I don't really know, LucidKitten!
But here's just a guess, based on your physical state.
Maybe if you process something "horrible", or if you're feeling anxious or stressed, while you're awake, then by the time you go to sleep, your energy levels, and stress hormone levels are already depleted, and your physical brain doesn't have the umph to produce dreams that are nightmarish.
And if you've bathed your brain in happy chemicals and hormones all day long, then those are depleted when you go to sleep, so your body makes due with what it's got left - stress hormones, and a lot of pent up energy.
This is a good question, and I hope someone knows if there's a real answer! Also . . . I know umph isn't a scientific word! I hope you get my drift.
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