The capularies expand due to CO2 build up and press on the nerves in your forehead behind the eyes.
It may not be related to your CPAP therapy at all.
I am not able to answer your question with certainty, but it is a possibility.
Experiencing these pulsating balls of energy in your hands can be an odd or even disturbing sensation, but there is nothing to worry about.
Must be your fault.
If you notice that you sneeze more after large meals, try eating smaller meals or eating slowly.