"Seven hours – that’s the lower limit of the threshold,” said Watson, who is also incoming president of the American Academy of Sleep Medicine, which issued the guidelines recently, jointly with the Sleep Research Society. “We don’t want people walking away thinking, ‘I need only seven hours of sleep a night.’ ”

In fact, the 15-member panel declined to put an upper limit on ideal sleep for adults aged 18 to 60 after spending a year reviewing more than 5,300 scientific articles about the link between sleep and optimal health. The results were published in the journal Sleep. Full story.

How many hours of sleep do you get each night?

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