7 hours may be the ideal amount of sleep starting in middle age - CNN

Seven hours of sleep is ideal for older adults and the middle-aged, with too little or too much sleep associated with a reduced ability to pay attention, remember and learn new things, solve problems and make decisions, according to new research.

Sign up for the Sleep, But Better newsletter series. Our seven-part guide has helpful hints to achieve better sleep. (CNN)The optimum amount of sleep is not too little but not too much -- at least … [+4640 chars]

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