Several characteristics have been identified that place individuals at high risk for OSA: * weight: People who are overweight (body mass index of 25 to 29.9) and obese (body mass index of 30 and above) * sex: Men are twice as likely to develop sleep apnea as women * neck circumference: Individuals with a short, wide neck (17 inches or more for men; 16 inches or more for women) * age: Middle-aged and older adults * lifestyle: Drinking alcohol before bedtime and smoking tobacco * genetics: Sleep apnea is known to run in families * race and ethnicity: Higher incidence among Blacks, Pacific Islanders, and Hispanics * physical features: Large tongue, large tonsils, recessed chin, low-hanging soft palate, and a deviated septum