Sleeping ?

I had my daughter on June 1... aside from the normal "tired mom", sleepless night kind of thing, I still managed to be able to fall asleep when I was tired. Although, within the last couple of days I have been struggling with falling asleep even when I am exhausted... I literally can lay here for hours extremely tired but not be able to doze off... I was wondering if anyone else has experienced this and what you did to overcome it? I am totally anti-drugs. So sleeping pills are out of the question for me.