Yesterday I was majorly pooped out (I too am a teacher and we were starting new projects in all of my classes - poor timing) but I knew the weather was changing for the WAY worse on Thursday so wanted to get some seat time in.

My trick was to take a 15 minute power nap (I set the microwave timer), ate a handful of nuts to carry me through vs having a full supper, managed to do a 31 mile ride. Ate something light, took a shower and went to bed by 10, the dishes and laundry will still be there on Thursday when it is 40 degrees out, windy and rainy.

In a word (or a few) power naps and priorities

BTW I don't know if you adjust or just get used to being tired as a natural state of affairs