To find out if you have sleep apnea have your spouse or someone else observe you when you go to sleep and have them watch out for episodes where you may have difficulty breathing or waking episodes. Also if you have a dry mouth when you wake up and/or feel like you have gotten a good amount sleep yet feel tired and fatigued throughout the day you may have sleep apnea. If you think you may have sleep apnea it is best to go and consult a doctor to find a treatment for you.