Why do humans need less sleep than primates? | World Economic Forum
How Much Sleep Do You Really Need? - National Sleep Foundation
Sleeping habits of the world revealed through Sleep Cycle app | Daily Mail Online
How Much Do We Sleep? Americans Don't Know - The Atlantic
Shut-Eye Deficit: OECD Survey Reveals Japan Most Lacking in Sleep | Nippon.com
Slept late: how much sleep is optimal? - Denk Nutrition
International Comparison of Average Daily Hours of Sleep | Download Scientific Diagram
How Much Sleep Do Different Age Groups Get in the UK? - Firstbeat
16 MARCH 2022: SLEEP DURATION: ASIA, EUROPE, UNITED STATES — PublicHealthMaps
How Do Your Sleep Habits Stack Up? - Fitbit Blog
Sleeping time (hours) of Japanese people - How much is it in Tokyo?
Can I have a healthy life with less than 8 hours of sleep? I have a 9-7 job and I'd like some more time to develop some hobbies. - Quora
Here's How Much Fitbit Users Sleep | PCMag
About 40% of Japanese adults getting less than 6 hours of sleep: survey - The Mainichi
A global quantification of “normal” sleep schedules using smartphone data | Science Advances
Stages of Sleep: What Happens in a Sleep Cycle | Sleep Foundation
How Many Hours Of Sleep You Need Each Night According To Your Age
Why Moms Need More Sleep and How to Get it - TrueDark®
Sleep Duration in Europe – Landgeist
