For me at least I found that anti-anxiety medication was the key to sleeping. But now I think about it, when I was put on Lamitical and Effexor I fall asleep fast. My newest problem is only sleeping for 3 hours or so at a time.

But one thing to go over with your doctor is why you cannot sleep, and try to treat the underlying cause if you can, and not the symptom of not sleeping. Are you worrying excessively night, do you have this crazy desire at times to be constructive and get stuff done, but cannot because your body is too tired, so you hope to sleep and wake up as fast as you can to get more stuff done? These sort of things are what should be looked at, as they could be anxiety or mania related, and fixed without having to resort to sleeping pills.

That said the single thing that helped me sleep the most is a white noise generator that is found in many doctors or therapist offices. It cancels out most little sounds and is random so you do not fixate on it. Thing was about 50 bucks online and improved my sleep greatly, and it was worth every penny I spent on it IMO. May not work for all, but some swear by it. If people have no clue what I am talking about here PM me and I will dig up where I found this thing at.