Yeah, me too.
I like my job, I like the people I work with, I like the kids, I like my schedule.
It must be my age, but I find myself getting very weary by mid-afternoon, which wouldn't be an issue if classes were over by then. But they're not...not until about an hour after I feel like curling up on the lab table with a blankie and pillow and taking a snooze.
Which they frown on.
Plus, the kids don't really take you seriously if they see you curled up on the lab table with a pillow and blankie.