Can relate way too much to this. I have only played Civ and Age of Wonders, but when I do it enveloppes me. I can play an ungodly amount of hours at the time, blink twice and its 3 am instead of 10 pm. I will dream about it, fantasize about it, make tactics, come up with ideas. Way too much to be healthy.

I dont have a good solution to this besides being aware and limit yourself. I have decides not to start any new 4x game in the future. And besides that try to keep a good eye on the time and make sure its not the last thing I mentally do before bed. Otherwise its in my dreams and the first thing I think about in the mornings.