With the full moon comming soon, it got me thinking. Why do people seem to act strangely during a full moon?

Since the gravitational effect from the moon controls the tides in the oceans and humans are mostly water (70% or so), is it safe to think that the moon could actually have some effect on us? I know during a full moon I don't sleep as well as I do when it's not a full moon.

Just something to think about.