Signs That it's Late Friday Afternoon and You're Exhausted: Number $x$ in a Continuing Series

Signs that it's late Friday afternoon and that you're exhausted (number $x$ in a continuing series): When you're giving a problem class and it's 5:35 pm and you're utterly convinced that you have gone overtime on the class that ends at 6pm, because you think it's after 6pm and the fact that the clock blatantly says "5:35" (though in analog) just doesn't faze you or register in any way.

And also number $x+1$: And also when you say you're going to erase the whiteboard as a courtesy to people who are using the room tomorrow morning ... which is in fact nobody because tomorrow is Saturday.

The legend continues...