If you don’t have a true timer handy, microwaves work just as well. Many have a timer function on them. If yours does not (or you’ve lost the handy dandy microwave manual) simply set the microwave to cook for the desired amount of time and set it on the lowest power level.

Optionally, use a free online alarm service such as Click to visit this external linkOnline Alarm Clock. Don’t forget to unplug the earphones and turn your computer volume up!