does anyone ever have these. where suddenly feel like your falling. a sudden drop out of nowhere. and it feels so real you jerk. and wake up suddenly. sometimes i have the sudden falling and jerking. even when im wide awake. it actually feels like ive really fallen. even though i havent. its only a moment. but takes alot out of you. waking/sitting up. is how i stop falling. not sure what would happen if i fell all the way. or how far the fall is.