I think the problem with most sleep medications is that they don't address the underlying disorder. It's not that you just have a sleep disorder. When the bipolar disorder or anxiety disorder is being treated, I think that you would sleep much more naturally.

When I began taking Lamictal that is when I finally began to experience natural sleep that I did not have to take anything else to achieve (and Lamictal has not been sedating for me, I take it in the morning.) Unfortunately, it seems like that effect isn't cutting it enough anymore.

I've never found a great cure for insomnia. Anti-histamines are hardly effective, Ambien and Lunesta have no effect, and melatonin and valerian barely touches the insomnia but makes me feel weird. Currently Trazodone is working but not consistently, once Mirtazapine was overly effective but during an extremely anxious period it only helped me sleep for 3 hours.

Make sure that you read about Melatonin. It will effect serotonin levels and can alter your sleep in an unpleasant way. Furthermore, you want to read about dosages, because higher dosages aren't always the best.

Light therapy in this case is definitely something that might help you. (Get sunshine right when you wake up, reduce light before you go to sleep.)

I'm not saying that this program is a cure, but I have always found the concept interesting: f.lux: software to make your life better (everyone else should check this out too!)