Insomnia Most people experience occasional insomnia sometime in their lives. However, a diagnosis of insomnia disorder, which is present in 10% to 15% of adults, requires a symptom, that is, difficulty with sleep onset, sleep maintenance, or nonrestorative sleep; a frequency and duration present on most nights over a period of at least 4 weeks; and a consequence, associated distress, or social occupational dysfunction. Insomnia disorder is most commonly comorbid (75%), in which the insomnia…