I think playing when tired is one of the biggest leaks many players don’t realize they have. For me, even if I feel “a little fine,” I notice that my patience goes down and I start forcing plays that I wouldn’t normally make. In a game like poker, where every small decision matters, that can quickly turn into losing sessions.
Personally, I try to avoid playing when I know I’m not sharp, especially in tournaments where focus is needed for several hours. If I sit down tired, I’m much more likely to bust out earlier just from one bad mistake. Cash games might give more flexibility since you can leave anytime, but even then, I find the EV is usually negative when I’m not fully rested.
I think the key is being honest with yourself about your energy level before starting. If I’m not at least 80–90% focused, I prefer to use that time for study, watching poker videos, or reviewing
hands. That way, I’m still working on my game without risking my
bankroll on low-quality decisions. Do you usually notice your mistakes right away when tired, or only after reviewing hands later?