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

How Sleep Deprivation Affects Your Heart

Dream ticket: how sleep became a billion-dollar business, Sleep

Why am I always tired if I get enough sleep?

Less than six hours sleep increases death risk from chronic disease

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Why Sleep Matters: Quantifying the Economic Costs of Insufficient Sleep

Poor sleep linked to dementia and early death, study finds

Sleep Deprivation: Symptoms, Treatment, & Effects

Poor sleep linked to dementia and early death, study finds

How Dangerous Is It When A Mother Sleeps With Her Baby? : Goats and Soda : NPR

Frontiers Sleep Disruption and Cancer: Chicken or the Egg?

Poor sleep linked to dementia and early death, study finds

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

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