Yes! I always feel so stupid when I do this to myself... I have to really try not to think about it otherwise I will, like you said, stay awake for hours if not practically all night. I don't know why it happens or what even causes me to freak out over falling asleep, but it certainly causes me great anxiety. When it does happen I just have an internal talk with myself, pumping myself out for the possible outcomes, by the time I'm done motivating myself to just get over it I'm usually asleep.Sometimes when I'm falling asleep I'll start to overthink about how weird sleep is and I get really anxious and afraid to fall asleep. I'll end up laying there for hours. Does this happen to anyone else?