IMAGES PROVIDED BY:
(1) Ugurhan Betin / iStockphoto
(2) Peter Cade / Riser
(3) Nucleus
(4) Keith Brofsky / Uppercut Images
(5) Tony Moow / Photolibrary
(6) Darrin Klimek / Digital Vision
(7) Jon Feingersh / Blend Images
(8) Buccina Studios / Thinkstock
(9) HASLOO / Thinkstock
(10) Philippe Garo / Photo Researchers, Inc.
(11) CMSP / Getty
REFERENCES:
American Academy of Family Physicians.
American Sleep Apnea Association.
Chan, J. American Family Physician, March 2004.
Cleveland Clinic.
National Heart, Lung, and Blood Institute.