This is an excellent review of major sleep disorders in just under 6 minutes! Since the video was filmed, the American Academy of Sleep Medicine has decided to consolidate Sleep Stages 3 and 4 so that we now speak of only 4 sleep stages. They are the lightest sleep Stage 1, deeper sleep Stage 2 (where we spend most of a normal night), deepest, slow wave sleep Stage 3 and dreaming sleep REM or Rapid Eye Movement Sleep.
If you are concerned you may have a sleep disorder or just want to talk more about it to find out, please leave your questions or comments below. You may also want to visit my Sleep Coaching website: http://www.SleepRestLive.com.
Best Wishes for Peaceful Sleep,