What is ambian? It hasn't even a wikipedia entry.
I think using meditation to get to sleep wouldn't be effective in your situation.
I would recommend some form of excercise.
Meditation with a focus on deep inhalation could also help you (at best right before sleeping).
Another form of therapy you could try is Brainwave therapy.
Transparent Corporation has a software you could try for 15 days. If that helps a bit it is worth the money for you. If it doesn't it won't cost you anything.
You could also try to adept polyphasic sleeping.
Whatever you do, please report back if it helped.