American Academy of Sleep Medicine

A night-owl dad asks if 8 PM bedtime is "for old people" — and the circadian science on wake maintenance zones says his instinct is right.

What if a task force treated light and time as public infrastructure? The science of circadian alignment — and the policies that follow.

A listener asks why 4 a.m. wake-ups feel so much worse than 1 a.m. — and what the insomnia science actually says to do about it.

N1, N2, N3, REM — what actually happens in each stage and how the cycle shifts across the night.

Night owls vs. clinical disorder—what sleep medicine actually says about delayed sleep-wake phase.

Before the industrial age, humans didn't sleep in one block. Discover why "first and second sleep" might be better for your brain.