You've probably experienced it—your alarm is set for 6:30 a.m., yet somehow your eyes snap open a few minutes before it goes off. There's no sound, no external cue, just the body somehow knowing it's ...

There is plenty of evidence about how important sunlight is to our circadian rhythm, and how the blue light we stare at on computers and televisions interrupts it. Many people have poor sleep, due to ...

The reality is, few wake up to the sound of birds chirping and light filtering in through the window. A far more common experience? Being jolted awake by the sound of a blaring iPhone alarm. And while ...