Not sleeping releases hormones that increase stress levels, speed up the heart rate and raise blood pressure
Getting less than SIX hours' sleep a night 'increases chance of early death' from a heart attack or stroke
Association of sleep duration in middle and old age with incidence of dementia
Why Sleep Matters: Quantifying the Economic Costs of Insufficient Sleep
Not sleeping sufficiently? Less than 6 hours of sleep can double death risk
Less Than 6 Hours of Sleep Could be Deadly for Some
How Dangerous Is It When A Mother Sleeps With Her Baby? : Goats and Soda : NPR
Getting less than six hours sleep a night increases risk of early death, The Independent
Why Not Getting Enough Sleep Is Bad for Your Health
IJERPH, Free Full-Text
Sleeping more than 8 hours a night could lead to an early death
Healthcare, Free Full-Text
Too little sleep could kill you: Premature death risk goes up for those who get less than 6 hours – New York Daily News
Dream ticket: how sleep became a billion-dollar business, Sleep
