Mirtazapine at very low dosage worked well for me. I don't remember how much mg's i used to take. 1/4 of pill knocked me out and gave very good quality of sleep. Negative side was very tired and exhausted feeling whole next day but it'll fade off in about a week or so.

Nowadays i take 50 mg seroquel prolong because it works for me and has some anxiety relieving effects too, unlike mirtazapine. (And because i just happen to have it in stock from days i was on larger dosage)