An estimated 40 to 70 million Americans have insomnia.1
According to these estimates, twice as many Americans suffer from
insomnia than from major depression.2 Patients with insomnia
frequently report physical and emotional health problems,
compromised social functioning, and daytime distress. Common
risk factors for insomnia include female gender, advanced age,
comorbid disease, and occupations involving shift work.
Importantly, comorbid medical disorders are becoming more
appreciated as risk factors for insomnia.