Getting less than six hours sleep a night increases risk of early death, The Independent

Not sleeping releases hormones that increase stress levels, speed up the heart rate and raise blood pressure

53 Sleep Statistics: How Many People Are Sleep Deprived?

Too little sleep could kill you: Premature death risk goes up for those who get less than 6 hours – New York Daily News

Sleeping less than 6 hours a night in midlife raises risk of dementia 30%, study finds

53 Sleep Statistics: How Many People Are Sleep Deprived?

Sleeping less than six hours could increase your risk of dementia and premature death

Getting a good night's sleep leads to 40 percent lower chance of an early death, study finds

Any less than 10 hours and I feel grumpy': meet the clean sleepers, Sleep

Sleeping between 7 and 9 hours a night can slash risk of early death

No, Night Owls Aren't Doomed to Die Early - The New York Times

Poor sleep linked to dementia and early death, study finds

Getting less than six hours of sleep may raise type 2 diabetes risk – study