How can I make myself sleepy?

I slept for 4 hours already and its 10 pm now. I dont have benedryl or anything. I am going to take a warm shower. I can nvr sleep! I get home from school and I just come and sleep because I get really tired. I cant focuss at school because Im so tired from lack of sleep. I dont fall asleep till like 5am. Tomorrow I have to get up at 5:30 and I really dont want to be sleepy at school.... it really affects my studies. I was wondering what I can do to make myself sleepy. =(