I bought a house a year ago which had laminate flooring installed across the entire house.
Sometimes I will sleep on the floor on a foam mattress topper. I noticed that there would be days where I'd fold up the mattress topper and the back side of it would be damp. I originally found this out after leaving the mattress topper on the floor for several days and would sleep on it nightly. When I finally picked it up to put it away, the backside actually had some mold / mildew growing.
Fast forward to today. My dog has a bed he sleeps on. I picked up the bed and notice it was wet underneath. I didn't think anything of it because I had just washed it a week ago and figured maybe I hadn't dried it completely, but as I thought more, it seemed similar to what I experienced with the mattress topper.
Either I just sweat a lot and the dog bed truly wasn't dry or there is some sort of condensation issue.