Too Much on the Brain

Does anyone know how to turn your brain off at night?
Here's my recent situation... We are all in the bed watching TV. Daniel falls asleep, Cody falls asleep. I put Cody in his bed and then ahhh... finally quiet. But wait why is my heart beating faster? Okay I'll just lay here for awhile and I am sure I will calm down and fall asleep...an hour later...what the heck I have been thinking about everything under the sun including thinking of calming down so I can go to sleep!!! Should I go take a sleep aid pill...well I am sure if I lay here a bit longer and concentrate on going to sleep it will happen. 1/2 hour later...ugh...what is my problem, why won't my mind turn off. Now if I take a sleeping aid it will be hard to wake up in the morning and I need to have enough time to get up and either shower before I take Cody to school or decide if I am going to go to the gym and fight the other mean Nazi women for a spin bike. Oh, and don't forget to make him a lunch and remember his homework...oh, do I want to go to the gym...I don't know. I guess I will just wait and see how I feel in the morning. Is there anything I need to do tomorrow while Cody is in school? Oh wait, I am suppose to be focusing on trying to get to sleep!! Okay so I was told to think of somewhere that was relaxing when I was a child...okay...why is the only thing that comes to mind is laying on the crazy pink shag carpet in my room when I was 6??? Weird. Okay, bag this idea. I guess I will just go take a sleep aid pill. After taking the sleep aid I now lay in bed thinking more for about another 45 min. until I finally feel tired and fall asleep!! PLEASE, does anyone have any suggestions?? I am getting desperate!