Does anybody else ever get this? It's like you're about to fall asleep, your thoughts start to travel off (thoughts that you're not consciously willing so much) and then bam.... you're alert and awake. Some nights this can play out numerous times in a row. I'll notice that when it happens my heart is racing a bit. Not too wildly. I'm wondering if it's just an adrenaline rush.... that's bringing me back. Or if my conscious mind is actually preventing me from drifting off. I'm guessing adrenaline rush. Maybe anxiety related.