About one in five people have middle-of-the-night insomnia.

More than a third of Americans wake up at 3 AM regularly. Here is the biology behind it and the fixes that actually work.

Waking up is hard enough. Waking up at the exact same time every day—even on weekends, when you could be luxuriating for another hour (or three) under the covers—can feel borderline unreasonable. Yet ...

That 3 AM wake-up isn't random. It's a blood sugar crash and a cheap bedtime snack with the right nutrients can stop it.