Think blue light is hurting your sleep cycle? A new study suggests it can actually improve the overall sleep quality of older adults — but only if they time it right.

Sunlight is a major source of blue light, although you can also be exposed to blue light from your computer, TV, or phone screen, says W. Christopher Winter, MD, a neurologist and sleep medicine ...

In winter, these processes often get out of sync. Light therapy can help. Skip to main content ... “Blue light has the most influence on our internal clocks,” explains chronobiologist Martha ...

However, the blue tapetum also lets up to 60 percent of UV light pass through to the eye’s color sensors. The reindeer likely see the winter world as a shade of purple the way a human may see a ...

The researchers note that the blue tapetum also allows up to 60 percent of ultraviolet light to enter the eye, meaning reindeer see their surroundings in winter in shades of purple with surfaces ...

The 6 Best Light Therapy Lamps for Winter Blues Dmytro Buianskyi - Getty Images "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." As a child, even ...