I've not really had that many problems with sleeping except for brief spells of insomnia during high school.
However, every now and then I'll be sleeping and I'll suddenly wake up by shooting straight up and inhaling once really deeply and sharply. I don't remember dreaming when this happens, and I don't feel like I normally do after having a nightmare, and I do not snore at all.
Does anyone else have this happen? I'm not too worried about it because it doesn't happen very often and it's over as soon as it does happen, but I am curious as to what it could be.