People who are active at night seem to perform better on cognitive abilities than morning larks who are active during morning hours, according to a study by researchers at Imperial College, London. The conclusions are based on data of 26,000 people who were examined for duration, sleep patterns and quality. The study found that sleeping between 7 to 9 hours a night was optimum for brain function, boosting cognitive functions such as memory, reasoning and speed of processing information. By ...

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