Mostly they aren't really "good" or "bad," but mostly just random brain junk. For example, I dreamt once that someone was trying to feed me an apple, and I didn't want it, yet they kept trying to give it to me.
That's an interesting question, actually. Recently, I've been having very odd dreams but for the most part they aren't all that bad. What's the difference between a bad dream and a nightmare?
I tend to get more bad dreams and that's okay with me. Whenever I wake up from a good dream, the feeling of disappointment that it wasn't real is worse than the relief I feel from waking up from a bad dream.
Honestly they're a bit in between. Usually they're good, but a good dream can suddenly turn south for no reason. Especially since they're usually pretty realistic for me, where I can even smell stuff going on in 'em. Super weird. I blame it on how easily I get anxiety, and for absolutely no reason whatsoever e u ea"