Why does rain and bad weather make You sleepy?

Even if I don't know it's raining (or getting ready too) I'll have trouble staying awake, almost to the point of passing out.
Why is that?

Butterfly2010-06-04T01:59:01Z

Favorite Answer

Bad weather makes many people lethargic and all their want to do is sleep (if possible)
Weather blues are quite common.As soon as the sun comes out people are coming back to life, so to speak.The older you get the more you feel it,I think.Chin up the sun will come out again....