REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

Deep sleep is the restorative stage of sleep. During this stage the body undergoes tissue repair, the immune system is ...

Another reason that stress could be waking you up is because it impacts how deeply you sleep. As explained above, lighter stages of sleep happen in the early morning so if you’re feeling stressed, ...

Sleeping well is vital for energy and good health — but getting the right amount of different stages of sleep can make all the difference. Among the various sleep stages, two of the most well ...

Research reveals how specific sleep stages protect brain vulnerable to Alzheimer's, offering hope through simple lifestyle ...

When we sleep we go through different sleep stages, from light, to deep and then to REM. Dr Kaylor explains that terrors happen during deep sleep. This is when the brain is in its deepest ...

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 reduced brain volume in regions vulnerable to the development of Alzheimer's disease over time.