Water was a great help for me developing my internal alarm clock. As a kid growing up on a farm, I had to get up at 4:30 AM to milk the cows, feed animals each morning. If I wasn't up and at'em at 4:30 sharp, my grandfather would pull my covers off, and dump a 1 quart plastic beer container (kind used for draft beer to go on sundays) full of ice and water over my head
. If I was lucky. If the old man got to me first, the consequences were usually much more grave. I still wake up at 4:30 AM, covering my face with my hands. Water works.