How to get rid of centrals

DankShroud,

You can see that before the CAs, your airway was fully open (based on the high peak flow rates), so after a few breaths under high pressure, the need for breathing efforts is temporarily reduced, kinda like hyperventilation.

For sleep quality, you need to optimize the pressure settings to reduce flow limitations.

You are showing zoomed in views of CA events that clearly follow you being awake. That is SWJ.
What is it that you don't understand???