During sws the eeg shows a much slower frequency with high amplitude signals delta waves. Benign snoring is often harmless but it can be an indication that sleep apnea will develop in the future. Sleep Study Received With Images Rem Sleep Disorder Rem Sleep The severity of this disease can be classified as mild moderate or severe depending upon the number of times per hour you experience these episodes during the course of the night. Stages of sleep apnea . Once rem sleep is over the body usually returns to stage 2 sleep. As you get older you sleep more lightly and get less deep sleep. Sleep begins in stage 1 and progresses into stages 2 and 3. Sleep apnea is when you stop breathing for 10 seconds or more. The first stage of sleep apnea is benign snoring. The sequence of sleep stages. Sleep apnea is the phenomenon whereby you stop breathing during sleep for 10 seconds at a time or longer. Minimal is roughly less than 10 of the mean normal airflow. Sleep stages are...