I cant get any sleep and need some!! im so tired and grumpy!! its summer break i wanna have fun! help!!!!!!!!?

ive always been able 2 go 2 sleep easily but for the past few days i cant get any sleep and i have a VERY busy schedule this week and need to feel good and have fun with my bday party where i wanna stay up really late! anyway ill lay down and be exhausted but wont get any sleep! ive tried sleeping w the tv and without, ive read a book, and all those things. but it is ike 3 am b4 i fall asleep and the nxt day is wrecked!!! The only thing stressing me out is my lack of sleep and how my white water rafting trip on wednesday and my bday party on friday are gonna be hard! im 12 and wanna have a fun summer break and stay up all nite 4 meh bday! plz. help, ME