Thread: Anyone know what causes?

It's a hypnagogic myoclonic twitch.

Basically, you've fallen asleep and a muscle, probably in your leg or arm has twitched, strongly enough to wake you up. The springs in your bed respond to the sudden movement giving you that bounce, and your mind interprets it as having fallen back onto your bed.
It's quite common and perfectly normal. I've often had it with a dream in which I've tripped or stumbled, reinforcing the feeling of having fallen into bed.

nice one thanks people gona look more in depth into this still

Wikipedia has a page on myoclonic twitches. Be warned, though, it deals mainly with much more severe cases than yours. Worth a look, unless you're a hypochodriac. Your case is absolutely nothing to be concerned about.

I have this happen a few times a month myself. But, from reading this thread, I don't understand why my whole body bounces so, because I sleep on a special mattress without springs, and you can't bounce on it, it's pretty solid...

I sleep on a hard couch, it feels like im floating in the air and then fall down to the bed and wake up because i hit the bed so hard. Freaky!