How do you get yourself to get out of bed when you feel like staying in, sometimes I will sleep for much longer than the eight hours I need and it is a waste of time. How do you get yourself to wake up? I imagine exercise would help me sleep better which would probably help, and going to bed tired as well (AKA doing a lot during the day to make myself tired). What's your take on this?

Edit: I am about to turn 19