An increased interest in the persistence of attention-deficit hyperactivity
disorder (ADHD) into adulthood brings concern that adult ADHD may become o
verdiagnosed. As with ADHD in childhood, various other adult psychological
and medical disorders may be associated with ADHD in adulthood and these re
lated disorders may be mislabeled and mistreated as simple ADHD. One such m
edical condition is sleep apnea. This paper reviews similarities and differ
ences between ADHD and sleep apnea and presents case histories of six adult
patients diagnosed with ADHD who were subsequently found to have at least
comorbid obstructive sleep apnea (OSA). Clinicians who diagnose and treat p
atients with ADHD are advised to become familiar with sleep apnea as a life
-threatening condition that presents with overlapping symptoms.