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You have a good question there - the answer is that bio-individuality will ultimately dictate how much sleep you actually need; however, I would caution that one's perception of the needed amount of sleep may be at odds with one's parents' view of how much sleep one needs. In conclusion, you must feel alert and energetic after only six hours sleep and be able to perform at your absolute best in all fields without the assistance of caffeine drinks (these drinks may provide the consumer with the impression that s/he is fine when it's the caffeine talking!)


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