It's actually bracketed: 7-8 is ideal. Anything less or more is bad for you (usual disclaimers, etc.): http://longevity.about.com/od/sleephealthandaging/a/slee

It's actually bracketed: 7-8 is ideal. Anything less or more is bad for you (usual disclaimers, etc.): http://longevity.about.com/od/sleephealthandaging/a/sleep_duration.htm http://longevity.about.com/od/sleephealthandaging/a/sleep_du...