Same thing happened to us in the Disney Fort Wilderness campground last year. Woke in the middle of the night thinking my feet felt wet. It turned out the whole end of the bed was soaked.
Since it rained almost every night we were there I just assumed we had a roof leak but, it hadn't rained that night.
I turned the unit off and the next morning I went up and checked the a/c but I never found anything and, it's never happened again. The filter was clean but all I can assume was it froze up.
I guess it does happen.
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