You logged 8 hours. So why are you still tired? These 7 overlooked factors could be wrecking your sleep quality.

Add Yahoo as a preferred source to see more of our stories on Google. Person wearing a wearable sleep tracker in bed Light sleep is the beginning of your sleep cycle and your body's way of winding ...

A nightcap might feel relaxing, but research shows it can fragment your sleep and reduce the quality of your rest.

A little-known and poorly understood sleep disorder that occurs during the rapid eye movement, or REM, stage of sleep has ...

REM (rapid eye movement) and non-REM (NREM) sleep stages contribute to systems memory consolidation in hippocampal-cortical circuits. However, the physiological mechanisms underlying REM memory ...

Getting enough sleep but still waking up tired? Doctors say these 7 factors are often the real culprits for older adults.

So while waking at 3 am can feel unsettling, occasional nighttime awakening is part of how sleep works. Understanding what is ...

Please provide your email address to receive an email when new articles are posted on . Prolonged REM sleep latency was associated with three key Alzheimer’s-specific pathological changes. REM sleep ...

For every 1 gram per kilogram increase in alcohol dose, REM sleep duration was reduced by 40.4 minutes. Alcohol consumption adversely affects rapid eye movement (REM) sleep in a dose-dependent manner, ...

All the most commonly prescribed drugs for mental and emotional disorders affect dreams—typically via their effects on REM sleep. Under healthy conditions REM sleep ‘turns on' when activity levels of ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. In the past, scientists ...