When I was having apnea episodes, I would also have stressful dreams and wake up exhausted. I also tend to experience body jerks. I already knew about the Central Apnea because I have had episodes when I was awake if I was in a bad neck posture. One night, my wife stayed awake and counted 16 episodes in one hour.

You can buy Pulse Ox alarms to use during sleep. They are not very expensive.