happens to me all the time, except the throwing up part. I wake up like a shot thinking I have stopped breathing or on the opposite end of the scale that my heart is going 200 bpm. Difference now is I am so experienced with it I just laugh it off and am fast asleep 1 minute later. I know it wont kill me, and even if it does so be it. I found it happened the most when I was dehydrated. It rarely if ever happens when I have drank enough water