Deep sleep is the mentally and physically restorative stage of sleep. How much of it do you actually need?

Most healthy adults spend roughly 20 per cent to 25 per cent of the night in REM sleep, while deep sleep typically accounts ...

It might be worth working a little bit harder to get that much-desired, but often elusive, good night's sleep. Deep sleep clears the mind of waste just as a "dishwasher" cleans dirty plates and ...

When it comes to managing anxiety disorders, William Shakespeare’s Macbeth had it right when he referred to sleep as the “balm of hurt minds.” While a full night of slumber stabilizes emotions, a ...

Researchers play ultra-brief tones to stimulate the brain during deep sleep. This stimulation improves cardiac output and relaxation of the left ventricle. Such technology to improve cardiovascular ...

Research has linked lack of deep sleep to memory issues in people at risk of developing Alzheimer’s disease. This isn’t the first study to tie deep sleep to Alzheimer’s risk. Experts say focusing on ...

Hot nights keep many people awake. A sleep specialist explains why heat interferes with rest and what actually helps.