Put your alarm clock across the room, so you'll have to actually get out of bed to turn it off. I know you said you want to wake up without one, but I can't think of anything else, other than a rooster.
Google "Alarm clocks for the deaf". They make an alarm click that hooks to a box that goes under your matters that shakes the bed, lamps that flash on and off, all kinds of different things. Not only will that stuff wake the deaf, it'll wake the dead.