Why do I crash at 3pm? The science behind the ‘afternoon slump’

You’ve just finished eating lunch and you’re back at your desk, ready to dive into the rest of the day’s work. Yet by 3pm, you find your eyes starting to droop. Before long, the only thing you can think about is how much you’d like to take a nap.

The “afternoon slump” (also sometimes called the “3pm slump”) is a common experience. It’s that distinct…

© La Conversation - lundi 7 septembre 2026