Obstructive sleep apnea is the most common sleep apnea diagnosis. You may have sleep apnea if you snore or stop breathing during sleep. This condition occurs as airflow becomes restricted or stops if the throat and tongue tissues relax during sleep and the airway becomes blocked. This can cause oxygen levels to drop forcing constant sleep disruption cycles from choking and gasping. These interruptions cause sufferers to wake up feeling unrested, stressed and fatigued from the lack of deep, restful sleep. If left untreated, the condition can lead to Stroke, cardiovascular problems, heart disease and diabetes.