Why Wont He Sleep?

Why oh Why will my son not sleep?? I went to bed at 11:30 last night and he was up at 12am and would not sleep until 1am. Then he was up EVERY hour after that. Finally he thought that it was time to awaken at 6am!!!!!!!!!!!!!! I got him back to sleep at 730am just in time for me to get up and get ready for work. NICE!!! grrrrrrrrrr