If it's not sleep, it could well be stress. I notice I make silly mistakes more often when I've been in a stressful situation for a while. Meditation's very go

If it's not sleep, it could well be stress. I notice I make silly mistakes more often when I've been in a stressful situation for a while. Meditation's very good for stress. So is therapy, in (almost) any of its varying forms, if you can afford it. It's also possible that you're not making silly mistakes as often as you think you are. Are you an overachiever, prone to anxiety, or otherwise worried about your performance? All of those could be contributing to making these mistakes prey on your mind. Finally, if these mistakes are seriously concerning you, have you tried tracking them via a medium that isn't your brain? For any sporadic problem like this, tracking it on paper or a spreadsheet, ideally with other relevant data (sleep, exercise, nutrition, stressors, off the top of my head) can often be extremely useful in pinning down what's going on. The only issue there is that sometimes tracking it can cause you to get more anxious about it - try to do so without judgement and with the expectation that you'll be able to solve the problem.