Drooling into the mask

I have been having a problem where I am apparently drooling into the mask when I sleep. I am not using a humidifier so the moisture is coming from me and not anywhere else. I do not wake up with a dry mouth or a stuffed up nose. It's not a ton of moisture, but it is a bit of an uncomfortable feeling and it also seems to effect the mask seal somewhat as the cushion slides around a bit as a result. I assume it's either mouth breathing or maybe the position I am sleeping in? Any insight would be great.

I guess that you really need a FF mask given your astronomically high prescription! It may sound counter-intuitive, but perhaps try adding humidification. Your drooling may be rebounding from dryness.