I do this too. Same principle applies in the gym - you start out the workout with the super strenuous squats and deadlifts, then move to the difficult bench pr

I do this too. Same principle applies in the gym - you start out the workout with the super strenuous squats and deadlifts, then move to the difficult bench press and dips, then finish with relatively easy bicep curls, tricep pushdown, and cardio. Some things just can't be done effectively unless you're above a certain level of rest; other things can be done even if you're tired. It just makes sense to sort things into the period of time where you can actually do them. In coding this extends all the way to watching lightweight YouTube videos about coding late at night when you're tired.