Natural aid to improve sleep quality?

[Lunar]

Grandote mentioned in the "8 mindless habits" thread using tart cherry for sleep and since I thought I had already tried everything natural under the sun to help improve sleep quality I was delighted to hear from the members hear something I hadn't.

Would anybody like to share any natural alternatives, and it also probably wouldn't hurt to mention things not to waste your money or time on, to aid in improving overall sleep quality?

I have trouble achieving full restful sleep cycles and would much rather prefer something natural and readily available to something that is not.

Thank You