I had that problem up until I graduated school...and now I often have it with work. The reason you cannot wake up is most likely because you haven't yet gotten enough sleep and so your mind and body are trying to force you to keep sleeping until you are refreshed. It is proven that while most adults usually need six to eight hours of sleep and can do on less, teenagers need eight to ten hours of sleep to feel refreshed because their brains are still growing. You are at a crucial time. Set a time that will allow you to have somewhere between eight to ten hours of sleep. obviously if you lay down and do this tomorrow you will not feel tired at that time at all. So gradually set your bedtime a little earlier every night until you reach that time. Buy a CD of relaxing sounds. I got one that was rain and thunderstorms, played very lightly on repeat. It helped me to sleep a litle better. lay down. don't be tempted to watch tv etc, while you are trying to sleep. read lightly for a little while, or just close your eyes and count the lengh o your inhales and exhales. count to four when you breathe in, and five when you breathe out. dont let other thoughts into your mind, just focus on counting. If you think of anything else, just let the thought float out of your mind. This is a relaxation teqnique. I've found it works well for me. Also try to make sure your room is dark. Even slight lights in your room can disturb the quality of your sleep. Good luck!