I use ZMA, both at home and out in the field. It usually takes quite awhile for it to kick in for me, so I usually stack it with melatonin or a GABA supplement. When I go that route, I'm usually getting tired around an hour or so after taking it. I generally have a difficult time going to sleep at home, but find it easier to out in the field. Granted I don't sleep the whole night straight through, but I tend to get half way decent sleep. Hope this helps!
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