text: I do the same thing -- it is very annoying.  I have tried to research it and can't find much about it other than it is normal when falling asleep.  I find that it happens most often when I am really stressed and/or really tired.  Also, the thing that was mentioned about too much caffeine late in the day might have to do with it, too.  If the twitching was all the time, I'd be worried and go to the doctor.  But I can't find anything abnormal about it happening as you fall asleep in any of my nursing books.  It is just SO FRUSTRATING!\n\nHere are some helpful links that I found:\n\nhttp://www.mayoclinic.com/health/myoclonus/AN00330\nhttp://www.cnn.com/HEALTH/library/DS/00191.html\nhttp://www.diagnose-me.com/cond/C254143.html