According to one expert:

"Inattention and hyperactivity are described as important symptoms or consequences of sleep-disordered breathing in current sleep textbooks, review articles, national academy courses, and American Academy of Pediatrics literature reviews and clinical practice guidelines."

Children with ADHD present 3 major types of sleep disturbances:

• Delayed sleep onset
  (could be related to hyperactivity or to limit-setting difficulties);
• Snoring
  (was 7-fold more frequent than in a general pediatric population, suggesting that sleep-disordered breathing may be playing a role);
• Restless sleep

It is still unclear how bad sleep disruption must be before ADHD-like symptoms appear. In particular, it is not known if snoring without sleep apnea can produce the symptoms.

Nevertheless, one authority has concluded:

"An assessment of sleep patterns and possible sleep problems should be part of the evaluation of every child presenting with behavioral and/or academic problems, especially Attention Deficit/Hyperactivity Disorder (ADHD)."