Why am I taking my CPAP off?

I am 7 weeks post-op and have been using my CPAP since last August when I was diagnosed with sleep apnea. I believe it is set on level 5. For several weeks now I will go to bed with it on but will wake up in the middle of the night and the mask will be off my face and machine will be off. I've cleaned it and changed the filter. I have no memory of taking it off my face during the night. What's going on? Sometimes I will wake up with a headache so I'd like to figure out why this is happening.

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