On an Apple Watch, "core sleep" is another name for light sleep, which scientists also call stages N1-N2. It is not a type of deep sleep, and has no relation to REM. But in the sc ...

A new study reveals that not getting enough of specific stages in the sleep ... 13 to 17 years each using polysomnography (which is essentially a fancy word for a sleep study) and with brain ...

Oxygen re-saturation during sleep is significantly affected by sleep stage and by cardiovascular and pulmonary comorbidities.

New research reveals that lower proportions of specific sleep stages are associated with ... The research utilized polysomnography to assess baseline sleep architecture. Advanced brain imaging ...

Each participant visited the research center three times spaced out every one to two months to take part in a polysomnography ...

Stage 2: Slightly deeper ... in the Atherosclerosis Risk in the Communities Study. They used polysomnography to assess sleep architecture. Then, they used MRI to look at the anatomical features ...

In the stillness of the night, when the body should lie calm in sleep, something else may be happening beneath the surface.