A study of more than 3,000 adolescents showed that those who went to bed the earliest, slept the longest, and had the lowest sleeping heart rates outperformed others on reading, vocabulary, problem solving and other mental tests.

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3. A study of more than 3,000 adolescents showed that those who went to bed the earliest, slept the longest, and had the lowest sleeping heart rates outperformed others on reading, vocabulary, problem solving and other mental tests.