Do what tiggs said and lay off the caffeine and sugar after 7. Infact lay off food altogether after 7 if at all possible.
You can get herbal sleep aids, or some people swear by camomile tea or warm milk, maybe a hot water bottle or a warm bath before bed.

Even if Psyko's alarm does wake you up, you could go back to sleep pretty easily if you don't open your eyes or get up or pay attention to it. If you like to get up with him and see him off to work then do that and then get yourself back to bed for a few more hours.

It might take a couple of months to get into a routine, but once you have it'll become a lot easier. Humans aren't nocturnal creatures and you just need your body to get back into a natural rhythm, which unless you have an incredibly busy and active life or have kids or are sick shouldn't include naps.

I really don't know how you can survive on so little sleep.
I can manage fine on 8 hours, but I've woken up after 10 and 11 hour sleeps and felt much better for it.