Why Is Snooze Nine Minutes?
It seems like ten minutes would make more sense, but the choice isn't arbitrary.
Here’s Why Yawning Is Contagious
Just one person doing it sets everyone off. But why is yawning contagious? Turns out, humans aren't the only animals...
Irregular Sleep Patterns May Have Kept Early Humans Safe from Predators, According to Science
We finally know why we're always getting up at the same time every night.