Light sleep or (Non-REM sleep) plays a role in the sleep cycle helping the body move into deep sleep modes. You usually spend more time in “light sleep” in the early part of the night.

HOUSTON — A good night’s sleep is important for both the body and brain. It’s essential to understand the four stages of sleep and how to get more restful z’s. Stage 1: Transitional sleep ...

The best sleep masks keep your circadian rhythm on track and prevent ambient light from harming your sleep quality. These are our top picks after weeks of testing.

A new study shows how math helps explain why babies nap erratically, teens stay up late, and older adults wake earlier.

For these night owls, the brief period of light sleep induced by the snooze button may actually help them transition from deeper stages of sleep interrupted by the first alarm into wakefulness, he ...

But how our body responds to light is also affecting how these clocks align with the 24-hour day. There's not just early birds and night owls. There's a full spectrum that goes to pretty great ...

Exposure to light at night, even at very low levels, has been linked to an increased risk of depression, according to a study published this month in the American Journal of Epidemiology. In ...

I’ve always needed near-total darkness to get a good night’s sleep, so night-lights were never something I thought much about. That is, until about two years ago, when I moved into an ...

Sleep expert Wendy Troxel, PhD — a RAND Corporation senior behavioral specialist and licensed clinical psychologist in Utah — shared a few reasons Americans aren’t sleeping through the night.