These substances relax the muscles in your throat which can worsen obstructive sleep apnea. If your fatigue is severe make sure that sleep apnea is not the culprit. What Causes Sleep Apnea With Images What Causes Sleep Apnea Having family members with sleep apnea might increase your risk. Can mild sleep apnea cause fatigue . Nonetheless people who have or who think they have even a mild form of sleep apnea should be aware of the symptoms and risks as well as the steps they can take to treat the condition and prevent it from becoming something more serious. Obstructive sleep apnea is a common and serious disorder in which breathing repeatedly stops for 10 seconds or more during sleep the disorder results in decreased oxygen in the blood and can. Obstructive sleep apnea osa is when your muscles relax and cause a full or partial blockage. In addition osa and depression are common causes of extreme fatigue in patients with severe sleep apnea. Signs that your fatigue may be cau...