A cartoon crowd of sleepy owls camped out on the ground under a hand-painted banner, staging a sit-in protest.
The banner reads "Stop the tyranny of larks!" — a joke, but a familiar one for anyone whose best hours start after most people's day is already over.

Some people are up, dressed, and cheerful before 7 a.m. Others don't feel like themselves until the afternoon and do their best work after dark. This is a small, ad-free collection of articles about why that happens: chronotypes, the body's internal clock, and the closely related subject of why the wrong schedule makes procrastination worse.