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Nap frequency and duration on cognitive ability, psychological well-being, behavior problems, and metabolic health. Verbal IQ (A), Performance IQ (B), and Metabolic Health (I, J) were objective assessments. Academic Achievement (C) was based on standardized tests. Grit (D), Self-control (E), and Happiness (F) were self-reported. Internalizing (G) and Externalizing (H) Behavior were rated by teachers.
