Sometimes, your kid comes home from school really irritable, and somewhat cranky, and rather irrational, and you know they're just tired.
Whatever went on at school today just wore them out.
And despite the fact that they wanted to do a bunch of things after school, and despite the fact that it's a gorgeous afternoon outside, you just feed them dinner early, put them in their pajamas, and send them to their bed for the night.
And sometimes, that's not the kid, but the teacher that has to be fed early and put to bed at early because of crankiness and general irritability.
And sometimes, that's at 6:23pm.