G. Kahn,
FYI, in Australia, the only form of Melatonin available is homoeopathic (well it was that way a couple of months ago and I believe it is still the case). I'm sure you can get the 'normal' melatonin over the Internet from the US though.
I personally don't like melatonin because I feel so grumpy the next day (or, shall I say my hubby doesn't like it!!).
Another alternative is Valerian, a herbal preparation.
Good luck with your sleeping problem. Let me know if you need any further information.