I used to do level design, to build my portfolio, for an America independent (and free) game developer so I'd have work on an American clock. One way I found to stay asleep, is to learn to sleep with music on in a pair of noise canceling headphones. Put something on and give it a shot, I'd stay sound asleep till I woke up.I'm between 2 army bases so I have planes etc flying over very low all day so get woken up frequently