ANSWERS: 7
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In essence yes, though that's as an average and some people need more than this.
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No, as for every hour less than 8 hours you don't sleep scientists say you are shortening your life. It lowers your immune system and damages your nerves and brain because it needs the rest.
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Studies have proven that 7 hours is the ideal amount of sleep for anyone.
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8 hours would be okay ...though :-)
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Only you would know to be honest, everyone is different although they have done sleep studies on people for years, truthfully there is no right or wrong answer on this its up to the individual.
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sleep however much you want, you'll be fine.
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An ideal amount of sleep for a 19yr old would be 9 hours
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