Psyblog reports on a study that shows the best sleeping position for removing waste from the brain most efficiently. It's on your side rather than face up or face down.
Does this mean if you sleep on your side you'll wake up having forgotten you watched that reality show?
No, they're talking about metabolic waste. Getting rid of it could help minimize your chances of developing Alzheimer's and other diseases.
So far they've tested this only on mice (makes you wonder how they get the mice to vary their sleep positions...on second thought, I don't want to know that, I'm guessing it involves tieing the little beggars up).
They're planning to test it on humans next, but it could be worth training yourself to sleep in that position now if you don't already.