7/17/2012 7:19:49 AM
Those who restrict themselves to seven hours of sleep a night could prevent their brain from ageing by an extra two years, compared with their peers who sleep too much - or not enough, scientists say. American researchers had found that older women who had managed seven hours a night had far better concentration and memories than those who slept for nine hours. Those who got less than five hours had been also found to suffer.
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