Someone who is awake all night gaming, then sleeps in the morning or later that day. In competitive games the average night time player is usually more dedicated and of a higher skill level than the average during the day, making ranked play at night a more risky and difficult prospect.
"Jim: Yea, we had like 10 ranked games, but we played in the middle of the night when all the vampires were out so it was pretty rough going.
Jimbo: Yea man, gaming vampires can be pretty sweaty."
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)