I'm Having Trouble Sleeping?

I am a fourteen year old girl w/ trouble sleeping. School is about to start in 2 days and I've stayed up and it is 9:23am . Ive been like this all summer. Im tryin 2 get myself back on track so I can feel sleepy at night but I am neva tired when it is at night. I cant sleep without the tv, Ive tried counting sheep but doesnt work, and I cant afford any medication. What can I do to make me go to sleep. I am in desperate need!!!!!!!!!!!!!!!!!!!!