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2. Is 4 hours of sleep enough? What sleeping too little does to ...

   www.aol.com/news/4-hours-sleep-enough-sleeping...

   Is 4 hours of sleep enough? Experts explain what happens to your body when you sleep four hours, health effects of sleep deprivation and tips to improve sleep.

3. Exercise and deep sleep give the brain a 24-hour boost - AOL

   www.aol.com/exercise-deep-sleep-brain-24...

   Improvement to cognitive performance caused by exercise could last for 24 hours, a new study shows. Scientists also linked getting 6 or more hours of sleep to better memory test scores the next day.

4. What Is Deep Sleep? Understanding the 4 Sleep Cycles & Why ...

   www.aol.com/deep-sleep-understanding-4-sleep...

   Most people get around 1.5 to two hours of slow-wave sleep if they get eight hours of shut-eye. This stage is key to waking up refreshed and ready for the day — and it’s what you’re hoping ...

5. Sleep and metabolism - Wikipedia

   en.wikipedia.org/wiki/Sleep_and_Metabolism

   Chronic sleep deprivation (less than 8 hours of sleep) is associated with an increase in body mass index (BMI) and obesity. In a study with 3000 patients, it was found that men and women who sleep less than 5 hours have elevated body mass index (BMI). In another study that followed about 70.000 women for 16 years, there was a significant ...

6. Sleep efficiency - Wikipedia

   en.wikipedia.org/wiki/Sleep_efficiency

   Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.

7. Sleep deprivation - Wikipedia

   en.wikipedia.org/wiki/Sleep_deprivation

   A 2004 editorial in the journal Sleep stated that, according to the available data, the average number of hours of sleep in a 24-hour period has not changed significantly in recent decades among adults. Furthermore, the editorial suggests that there is a range of normal sleep time required by healthy adults, and many indicators used to suggest ...