Ramelteon
"This pill is the only sleep medicine that hasn't made me hallucinate (like Ambien and Sonata), made me gain weight (like so many mood stabilizers) or made me sleep too much. In fact, I haven't had really any side effects whatsoever. 

It takes 3 weeks to get working, but after that, my sleep became regular, and I get about 6-8 hours a night. Perfect!"