another weird sleeping thing

[desiderata]

i keep having this weird thing happem to me and im wondering if anyone else has experianced it, as im drifting off to sleep i keep having a really quick breath out, hard to explain but all of a sudden i jsut breath real quick out of my mouth jsut once, ( kind of like if you are testing your breath and you breath out) anyone know what im on about lol?

[andirubes]

Yes.  I've had similar things happen, and mostly around times of high stress or not sleeping enough. 
It's almost like I can feel myself falling asleep while I'm still awake...if that makes sense.  but sometimes I will just kinda of breathe out fast and then cough, like to catch a breath I missed!  IT's so weird.