Yuck!! I had an overnight in Denver earlier this year at an airport hotel. I stayed in the hotel a total of 7 or 8 hours (between flights). I stay regularly at the hotel I was at the following night in SLC and have never had any problems there.

I'm convinced it was the Denver hotel that left me little red bites for a week on my legs -- I thought I felt something that night but ignored it. I don't know what it was exactly (and don't want to find out) but I won't be back there again.