This is my second purchase of a sleep number bed. My first was probably 20 years ago, ended up with a terrible back mold problem. Fast forward 20 years, new husband wants a sleep number, so we were reassured the black mold problem was resolved. We've been sleeping in the is bed for 3 years now, i've recently started having nightsweats. Flashback, this is exactly what happened with the mold problem 20 years ago. I unzip my sleep number and sure enough, my air chamber is discolored from my knees to my head. I cannot see mildew or mold with the naked eye but it's sure to come as the obvious dampness continues. So disappointing... These cost too much money to have problems like this.