Quetiapine
"This is the only medication I've taken so far for insomnia that has worked consistently. I take 25 mg a night (or sometimes I just take half a pill - 12.5 mg, bc it's so sedating) and about 30-60 minutes later, I'm asleep. I'm a chronic insomniac with bipolar 1 so this medication really keeps me stable by making me sleep. I do feel a little groggy in the morning though and this mes makes me want to eat everything in sight! I've heard it's prescribed off label to anorexics to make them eat! If you go straight to sleep after taking it and don't get up and eat everything, it's possible not to gain weight at a low dose."