[vidarh]

I switch to doing anything mind-numbingly boring where mistakes will not cause critical problems when I'm sleep deprived.

E.g. at home, if I notice I'm too tired to focus on something challenging, I'll do the dishes, or clean the kitchen, or tidy up.

At work, I might tidy the server room, or go through my cron-job folder and investigate all the errors/warnings I've filed away as "annoying but harmless; needs fixing some day" that usually involve fixes that are low risk and easy to verify. Anything that are risky (e.g. requiring changes to a production database server...) I'll defer if possible.

I find a lot of the boring/reptitive tasks are easier to do when I'm tired, as when I'm tired I fall into repetitive routines easily, so as long as I push myself to get started on something repetitive, I'll just keep doing it without getting easily distracted.