I've only ever had to be put under twice in my life that I can recall (once for tubes in my ears and second more recently for my wisdom teeth removal), and it has never happened to me. BUT I have woken up at night before when I was just physically exhausted. My mind was awake, but I could not move anything, not even my eyes to open them. It FREAKED ME OUT. Thankfully my body usually wakes up maybe ten or so seconds after my "brain" does, but I hate it, HAAAAATE it, when it happens, it really scares me