Try and shift sideways. Ask to work in a different team with different languages, maybe devops or administration. Sometimes a change is as good as a holiday. Y

Try and shift sideways. Ask to work in a different team with different languages, maybe devops or administration. Sometimes a change is as good as a holiday. Your brain should not be getting foggier at 33. That is not old. Stress and poor sleep is a toxic combination. Solving them should be a priority. Maybe quit caffeine, alcohol or any other lifestyle factors that might be involved. Do you get RSI from using a mouse? Try swapping hands...being uncoordinated with your other hand is a good thing as you will use a different set of muscles in your shoulder/upper arm to compensate that gives mercy to your wrist and forearm. Do you listen to music while you work? Sometimes that helps me focus, or at least stops surrounding distractions. And I would suggest taking a long holiday where you don't see a computer for at month or two, although with a family that might be difficult/impossible.