Zeitgeber, by Greg Egan

Second paragraph of third chapter:

Sam’s eyes snapped open, and half the class burst into laughter. “Very funny,” he said. “But you’ve only got ten minutes left, so you should probably save the jokes until then.”

Another of the short works that I have been saving up from the 2020 Hugo packet, this is about a contemporary world where people start to live on different sleeping schedules from each other, and how we can cope; and whether this is in fact something that needs to be corrected, or whether society needs to make accommodations for those who are different. You can get it here.

This was the shortest unread book on my shelves acquired in 2020. Next on that pile is Knowledgeable Creatures, by Christopher Rowe.