Children with ADHD sleep about half an hour less than those without the disorder and get about 16 minutes less REM sleep, according to a study. "I do not believe that sleep per se is the cause of ADHD, but it may make the symptoms worse in children with sleep problems," said lead author Reut Gruber of the Douglas Mental Health University Institute. "More research needs to be done in order to determine if sleep affects ADHD children with no primary sleep disorder."

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