Melatonin works for me to an extent, it allows me to sleep for periods, still gets broken up but I wouldn't want anything stronger regularly - although on occasion something to knock me out just to catch up might be nice (but GP won't prescribe now as he thinks I'm a suicide risk).

Melatonin is one of those substances that often works best in small doses, I just use 1mg and have another sub lingual 2 mg when needed.