I'm under the impression you can take this magnesium at any time of day but I'm working through my second container of this kind and it's almost like a signal to my brain that it's time to wind down. I love the taste, it's like a faint, almost salty lemonade. I froth it so it will mix well and I've been having the best sleep of my life. Now granted, I also mouth tape and use an eye mask and gua sha and yada yada but I feel like this has definitely kicked up my sleep routine a notch. It's a great price point so I say give it a try and see if it's for you! Magnesium is the one thing I know we all need and was lacking in my life so this is the perfect staple supplement for me.