The #1 best sleep aid in the world is to sleep in a pitch dark room. Most often when people have chronic sleep problems they are unusually sensative to the smallest amounts of light. Even the glow of a dim electric clock face or an outside street light is all that is needed to stop them from being able to naturally produce melatonin.
Darkness is required for natural melatonin production. Hyper sensative people need ABSOLUTE darkness. If you can see your hand it isn't dark enough.