So I guess the answer to my question is that ZMA has no effect if your zinc and magnesium levels are adequate, but it's not likely that your zinc and magnesium levels are adequate, especially if you exercise regularly. Also referencing my last post, is there any evidence to suggest that traditional hunter/gatherer societies had the levels of zinc/magnesium deficiency that America has today?
I've had trouble sleeping for a while, can't get more than 5-6 hours sleep, wake up at least once during the middle of the night. Zinc/Magnesium deficiency is something that I've never considered, so I'm going to give it a try, because I feel like I've tried everything else. I'll report back with my experiences.