if its a good game I would go into a trance almost. I would still eat but that doesn't take that long, game can be on pause. Unless its an mmo, then you just found somewhere safe to sit or log out for the time.
Most of the time it has occurred would be in arpg games. Single player games where you could pause for most part.
Pretty much any new game will have me up late if I can. Especially if its the day I got game. Doesn't help I normally buy them at night. I should learn not to do that but I don't think to look at steam first thing in day... I have a routine and looking at Steam isn't on it normally.