While it is difficult to fundamentally change your chronotype, it does naturally shift as you age.Composite: Rita Liu/The Guardian/Getty Images We all know that early birds get the worm. But who wants ...

In the protective silence of darkness, another world awakens, where night birds reign. Capable of intense nocturnal activity, these people reveal the richness and diversity of life’s rhythms with ...

Forget the self-help books. When it comes to your fundamental biological tendency for a preferred wake-sleep schedule — your chronotype — you can’t just decide to be a morning person. It’s hardwired, ...

If you have day-hiked in the Smokies, you have undoubtedly been monitored, unawares, from a tree cavity. The unseen watcher? A winged super-predator resting with one eye open, waiting for dusk or ...