I despise sleepless nights!

I have been laying in bed for almost an hour and a half now, and I don't even feel a little tired. Why does this happen? I need sleep more than ever and I can't get all the thoughts and to do lists out of my head long enough to settle down and sleep. I just wish I could sleep!! So, I will try and do some of the things on my to do lists and see if that calms me down enough... hopefully it will.... I will keep you posted!