got a few times this kinda thing happen b4.
but actually i think it's just that only only part of our body has
woken up. last time newspaper got say b4, something about left and
right brain. but quite long liao, so dun really remember.
this kinda thing very easy to counter one lah, u try search for a
part of your body that can move, usually is toes and fingers, just
keep on moving them until your blood circulation improves, after
like 2-3 seconds you can shake your feet liao, usually after that
you'll just jolt awake.
but i feel what's scary about this is very hard to breathe, when
this happens, sometimes i cannot breathe at all. u gotta remain
calm, close your eyes and dun think of anything, then everything ok
liaoz.