I would use the DAA before bed or pre-workout (40 mins) now as for erase why take just one? Are you trying to make a bottle last 90 days? 2 would be better, 1 morning 1 afternoon and you'd get 45 days worth that way. Might cause joint pain from low estrogen, add a joint supp to the mix if you do get dry joints. Just my opinion though, lets see what others think. I've read that calcium can effect zma absorption, so do some research, if you have dairy with dinner it might decrease effect. I never had much use for zma myself, but I hope it works for you!