Outcome of patients with sleep complaints and normal polysomnograms.

325 I has been estimated that the prevalence of obstructive sleep apnea in the United States is 7 to 18 million.1 An increasing recognition of other sleep disorders has probably led to a significant increase in the number of polysomnographic studies (PSGs).2 According to 1 large survey, 5% to 10% of patients referred for evaluation of insomnia or excessive daytime sleepiness had no significant PSG abnormalities, but there is little follow-up information in the literature on patients with sleep-related symptoms and normal PSGs. The purpose of this paper is to present demographic and follow-up data on patients with sleep complaints who meet strict criteria for a normal PSG.