Back when playing WarCraft 2 after long sessions I'd try and go to sleep but whenever I closed my eyes I'd have burn in. So i'd see the units in my minds eye and i'd be controlling them in massive map wide battles. Thing was, it wasn't really a bothering thing, it was pretty awesome. So I'd pull myself out of bed and play more. The last few maps in the campaign for humans was pretty sweet, about the time you could get castles.
I hate the idea of balance to gaming, I like to game pretty much all out and if a game is good enough to get me in a deep or even better, an all nighter, i'm thankful for the opportunity to indulge. Civ II, Warcraft 2, Dragon Age, Baldurs Gate II, Diablo II... these pretty much were periods where if a non gamer looked in on my they'd just be baffled.
I also like to talk to the screen about how much BS is involved when I get stuck on boss battles, that's when I know I should take a break.