I work out in the evening also and I find it depletes me, I also find that it sets me up for nice testosterone levels for my lady, showering and relaxing into bed together, having sex or not, and my sleep is great.
The only thing that has interrupted that flow is this board. and with that I will add that having that protein shake with a healthy mini-meal works quite nicely.
Scientifically I know very little. But from experience I find the evening work out are great for me.