A teenager begins sleeping through alarms, stops finishing assignments, withdraws from friends, and seems irritable nearly all the time. Depression is one possibility. So are anxiety, ADHD, substance use, chronic sleep deprivation, or a reaction to something happening at home or school. Could a medical problem be producing, worsening, or disguising itself as a psychiatric one? Fatigue, poor concentration, restlessness, disrupted sleep, appetite changes, declining school perfo