By Steven Reinberg HealthDay Reporter

MONDAY, Sept. 21, 2020 (HealthDay News) -- Everyone needs sleep, but too little or too much of it might contribute to declines in thinking, a new study suggests.

Too little sleep was defined as four or fewer hours a night, while too much was deemed 10 or more hours a night. The ideal amount? Seven hours a night.

"Cognitive function should be monitored in individuals with insufficient or excessive sleep," said study author Yanjun Ma, from Peking University Clinical Research Institute, in China.

Still, Ma cautioned that the study can't prove that too little or too much sleep causes mental ("cognitive") decline, only that there appears to be an association.

According to the National Sleep Foundation, sleep is essential because it lets your body and mind recharge. The right amount of sleep also helps you stay healthy and prevent diseases.

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