Does anyone take ZMA? (zinc magnesium and vitamin b6) I've been taking this for a while now and I'm not convinced on its body building or lifting qualities however the sleep I get on this supplement is outlandish. I'll sleep for 5 hours and it feels like I got 10 and that's worth the cost right there, in my opinion. I get mine from Optimum Nutrition but I've read the other brands are fine too. What are guys opinions on it?