Waking up, checking the time and realizing it's too early. Then being unable to fall back asleep for being too nervous about waking up on time because of an early appointment. Even worse when it happens like, an hour before I'm supposed to get out of bed. (In case anyone suggests alarm clocks or something of the like, they're always set... always, even when I don't need them to ring in the morning [size=7]fuck[/h]).