Many people snore loudly and there is cessation of respiration for few seconds called apnea. Apnea episodes can lead to reduced oxygen in the body to cause a disease known as obstructive sleep apnea. It is usually a disease in obese patients. Symptoms include irritability, forgetfulness, morning headache and day time sleepiness. Untreated disease lead to occurrence of hypertension, stroke, heart attack and sudden death. Polysomnogram or sleep test records breathing, heart rate, oxygen saturation, EEG and leg movement during sleep to diagnose OSA. People with above symptoms should get themselves tested.