Vouched. One of the things as we get older is not being able to slog out big days. Sleep is very important and underrated by many.

However I suspect given your symptoms you might benefit from taking quarter teaspoon of pure quality creatine every day. From my use of it from time to time, I suspect less is best, than the larger quantities some people use to bulk up since I've asked a few who do use it a lot, if they noticed this and that as way of cognitive improvements ... and they didn't have much to say on it.