How Much Sleep Do You Need? - HelpGuide.org
Is 6 Hours of Sleep Enough? | Puffy Blog
YouGov | One in three Australians not getting enough sleep
3 Charts | The Importance of Sleep for Weight Loss | Visualized Science
Fatigue Science on Twitter: "Researchers find those sleeping 6 hours or less a night are 4x more likely to get sick http://t.co/MPNHZpTUWZ http://t.co/jOUzuQDGMD" / Twitter
About 40% of Japanese adults getting less than 6 hours of sleep: survey - The Mainichi
The secret to success is sleep. - By Dr. Carmel Harrington
Three quarters of Brits get less than eight hours sleep | YouGov
What happens to your body if you sleep 8 hours every day?
How Many Hours of Sleep are Good for Health? (from 5 to 8) | Sleep, Sleeping too much, Go to bed early
8 Hours or 7 Hours of Sleep, What's the Difference? | SiOWfa15: Science in Our World: Certainty and Controversy
Is it healthy to sleep 6 hours at day? - Quora
Short Sleep Duration Among Middle School and High School Students — United States, 2015 | MMWR
When sleeping for less than 7 hours continues, the risk of developing various diseases increases from mental disease to sexual dysfunction - GIGAZINE
Is six hours of sleep enough for men?
I got used to sleeping for only 6 hours or sometimes less. Is that bad? - Quora
8 Hours or 7 Hours of Sleep, What's the Difference? | SiOWfa15: Science in Our World: Certainty and Controversy
Shut-Eye Deficit: OECD Survey Reveals Japan Most Lacking in Sleep | Nippon.com
Distribution of sleep duration by age and sex. | Download Scientific Diagram
If the recommended amount of sleep is 7-8 hours a night, how come so many people survive and are just fine on only 5-6 hours of sleep? - Quora
What happens if you regularly only get 3 hours of sleep per night? - Quora
