Sleeping off whenever I playing video games in the night is common. It's why I ruled out playing video games in the night from 22:00 upwards. I sleep off quickly from that time, trying to play games by that time is futile.
I mostly try not to stay up late playing video games. I used to have really bad issues with that back when I was younger and it really did effect me at my day job.
I remember once passing out when I was in an Xbox Party with a friend and they knew I had fallen asleep by how quiet I was but I can't say I have ever fallen asleep any other time when playing video games. If I start to feel tired when I am playing, I will turn off and head to bed.