how can i sleep for only three hours? in my experience, alarms won't be effective at waking me up that soon even if the phone is right near my head at full volume. (i am not referring to waking up and falling back asleep, but rather not waking up at all.) so i need a way to actually wake up at the time that i want to wake up without sleeping through my alarms. please give me a method to wake up after three hours of sleep that would work consistently. it should not involve getting somebody else to wake me up. thanks