Obstructive Sleep Apnea (OSA) associated with excessive daytime sleepiness, or OSA syndrome, is estimated to occur in 1 of 20 adults or about 5% of the general population in the United States . An epidemiological review by Young et al. estimates that about 1 in 5 adults have at least mild OSA and 1 in 15 adults have at least moderate OSA . OSA is becoming increasingly prevalent. Nevertheless, mainly due to lack of awareness by the public and healthcare professionals, the vast majority remain undiagnosed and untreated. Data from the Wisconsin Sleep Cohort study estimated that 93% of women and 82% of men with moderate-to-severe sleep apnea were undiagnosed . A follow-up publication from the Wisconsin Cohort Study five years later indicated that the prevalence of OSA in people aged 30-60 years was 9-24% for men and 4-9% for women.