happened to me once,but i did not sleep long.
happened when i was in the army,either some noise or a bad dream
woke me up unexpectedly in the morning,am aware of everything and
wanted to move but found that i can't move any single muscle,tried
to speak out and can't too,but i keep trying to make my body move
and only after like 5 mins,some feeling return to my body.struggled
to get up and thou now limbs can move a bit,it is like they weigh a
ton,like some external force giving a heavy resistant against my
every movement.was like this for like 10 mins more b4 i regain
normal movement ablity.
people say is mind wake up unexpectedly while my body is still in
sleep mode apart from the bei gui ya reason