(Guest Review) There is lots of good food and plenty of spaces to pass out on the floor. The staff are overall courteous, and people mind their own business (at least while airside). The chairs aren't overly comfy, but I've come to expect that from airport.
(Guest Review) Slept over night in salt lake to avoid paying for a hotel for 6 hours of sleep. Stayed in February and I think they turn the heat off at night. Be sure to bring a blanket or buy one before shops close. No issues from security cleaning staff was loud and definitely penetrated my bubble. We did not scope very well but slept near a terminal desk under security cameras. If I were to do it again I would find a spot closer to the main building.
(Guest Review by NYVTmaplesyrup) Probably as good as an overnight can be. Airport is officially open 24 hours so no one questioned me or thought it was weird. There was one place open 24 hours for food/coffee/water. I stayed in the gate area within security. Free wifi. No real problems, of course the cleaners need to clean overnight so i just moved when i saw those machines making their way towards me. Moving around is a necessity overnight as you need to move when the loud cleaning crew is near you so they can clean that space but also because its loud and annoying.