I've woken up laughing, crying, scratching myself, biting my pillow, and everything in between. Waking up laughing is so weird though, at least to me, because once I'm awake I immediately stop and I'm never sure if I was laughing out loud or in the dream, but I've got sore stomach muscles from laughing, but I can't remember if I actually heard it or not... so confusing! @_@ and kind of embarassing.