This happens to me pretty often, maybe like once a month. It usually happens if someone/something wakes me up while in the middle of a dream, usually after about six or seven hours of sleep, and then I immediately go back to sleep.
Last night I had a dream I went to the World Series of Poker and challenged everyone to a Halo tournament. And TOTALLY kicked the shit outta everyone. Someone was all "hey let's play on hte new maps" and i was all "the new maps are gay" then I killed his whole team. It was cool.
DREAMS! DREAMS! DREAMS! BOY DO I GOT ALOT OF DREAMS!