Good sleep hygiene calls for, among other things, a cool, dark and relaxing environment. It turns out the dark part is key to helping prevent heart disease. People who are exposed to more artificial ...

There's nothing worse than trying to fall asleep at night while the light from a nearby streetlamp beams through your window. Beyond just being a nuisance, nighttime light pollution can have serious ...

A team of scientists from Harvard Medical School and Duke University has created a new kind of tissue that can change heart activity using only light—no wires, no surgery, no harm. This groundbreaking ...