The negative implications of sleep deprivation are well documented; it can cause problems with memory and concentration and has been associated with increased risk of obesity, diabetes and heart disease. But a new study suggests getting too much sleep may also be bad for us: it could significantly increase the risk of stroke.

The research team, including Yue Leng of the Department of Public Health and Primary Care at the University of Cambridge in the U.K., publishes its findings in the journal Neurology.

According to the National Sleep Foundation, adults aged 18-64 should get 7-9 hours of sleep each night.

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