I discuss melatonin's effects on sleep & its safety; I segue into the general benefits of sleep and the severely disrupted sleep of the modern Western world, the cost of melatonin use and the benefit (eg. enforcing regular bedtimes), followed by a basic cost-benefit analysis of melatonin concluding that the net profit is large enough to be worth giving it a try barring unusual conditions or very pessimistic safety estimates.
Full essay: http://www.gwern.net/Melatonin
Thanks for the reply. I didn't mean to make you do the leg work for me.
I think I'll believe them, but think they're taking too much. The metastudy I read a while ago (couldn't find it in a couple minutes, but I'll look harder if you want to see it) said that people were taking too much (>1mg) because there was a patent or something on using it at <1mg doses where it worked best. This led to people developing tolerances and the studies reflecting this. All the studies you listed were with lower doses of melatonin, so it makes sense that they didn't.
I guess I'll try taking it regularly now.