Nearing 40s and I can’t imagine how I used to live with gaming all nighters either. But I have found recently that not just a late night, but a full night without sleep, and pushing through the next morning did bring about a lot of mental clarity the following day.
One of the cruelest aspects of whatever kind of insomnia I have is that while I normal get only 2-3 hours of sleep per night and feel disabled most of the day, every 3-5 years I get maybe 8-9 hours, and I have a pounding headache for the first 10 or so hours after I wake up.
Gone are my days of playing Ultima IV all night and feeling giddy in the morning.