Follow-Up:
I was the same way when I was in high school. I read about a trick to help me sleep. you lay down and try to relax. focus on one of your legs, the more relax you leg is the heavier it feels. After it feels like it is so heavy you can't move it do the same thing to your other leg, then your arms. you will be asleep long before all your limbs feel heavy. That's what worked for me!