Trazodone
"I have Bi-Polar II. Have suffered from depression, hypo-mania, and anxiety. One thing constant was difficulty sleeping. Sometimes night after night. I would just lay there and my mind would race. I have been taking Trazadone for a little over a year. 50mg-100 if needed. I've taken as much as 100, but often 50 then another 25 if needed. It's the best sleep I have ever had. I sleep through the night. If I have to get up for the bathroom, I fall right back to sleep. If I take higher doses I do get some grogginess, occasional blurry vision, and joint ache. But getting good sleep is worth it and helps with my other bi-polar symptoms. These days I've only been taking 50 but it  still works and side effects are fewer."