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How much sleep each individual needs can vary. There is no magic number, according to SleepFoundation.org. "While you may be at your absolute best sleeping seven hours a night, someone else may clearly need nine hours to have a happy, productive life." And a February 2015 article at LiveScience.com says that ". . . although the NSF [National Sleep Foundation] recommends that adults ages 26 to 64 sleep 7 to 9 hours, it may be appropriate for some people to sleep for as little as 6 hours, or as long as 10 hours, the guidelines say." (See Infographic below.)
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If you don't get enough sleep at night, naps can help bridge the gap. (See my previous post, How To Procrastinate.) Either way, being well-rested can help you do your best work.