It is estimated that 20% of US adults have obstructive sleep apnea and that 90% of those with the condition are undiagnosed. If you frequently snore, regularly feel tired after sleeping for more than 9 hours, and/or wake up frequently in the middle of the night, possibly feeling like you are choking, SEE SLEEP MEDICINE. Not only can treatment greatly improve your life, but sleep apnea can cause a myriad of potentially fatal health issues when left untreated.