Natural Ways to Improve Sleep
I've been saying for years that melatonin works best in smaller doses that mimic the physiologic dose that your brain provides as a signal for shutting it down at day's end.
Many people (and manufacturers) figure that if a little is good, more must be better and you can get melatonin in 10-50 times that dose. The problem is that larger doses don't work as well and have more side effects.
Here's a great review article from Psychology Today that explains what we know about this crucial sleep hormone.
Make sure your sleep hygiene is good, consider listening to my Natural Restful Sleep audio. A special form of brief psychotherapy called CBT-I is also very helpful with sleep issues.