I agree about talking to the doc. You might consider melatonin, though. It's OTC, safe, and works well for some people. I've been using that off-and-on throughout treatment. Go with the lowest OTC dose, though. It's a natural compound and if the body gets too much it just ignores the signal.
Also, talk to your doc about Ambien (lasts roughly 8 hours) vs. Sonata (lasts about 2 hours).