Last night, While trying to fall asleep, I had an interesting thought. What does how we sleep say about us. Is there some significance to whether I sleep on my stomach or on my back. Does someone who sleeps on their right side have a different personality the someone who sleeps on their left? What about the position of the arms, legs, and head. Does any of that have any relation to our psychological states?

I don't know if there has been a study on this, and I don't have the knowledge needed to figure this out on my own, but it would be interesting to know, even if it is just a piece of useless knowledge,