Security is an issue now in the US and you can not sleep on the other side of security now. Additionally, most airports do not want passengers sleeping there overnight or midday. That’s why there are ARMRESTS on most seats, it prevents you from LAYING DOWN. Seating is limited as well.
As you look over the list, you see Asian countries accomodate their travelers. comfy seats, showers, etc. I doubt American tourist, locally, would treat these amenitites with care. Ever notice how people just toss newspapers on the floor in the boarding area? McDonald’s bag? Empty Starbucks cup, tipped over, staining the carpet.
That’s all I want greeting me at 6am in the morning. A lounge area full of people (all snoring and farting) too frugile to pay for a hotel room.

Two of us arrived in Dallas early one morning, after a long redeye flight, and realized we had a 7 hour layover before our flight to Belize. We wandered through the airport a bit, then found a quiet, empty seating area with a little nook. Against the wall were two army-type cots. We quickly unfolded the cots, and took a nice snooze. No one bothered us.

I also had a four or five our layover in Atlanta in the middle of the night. It was too short to bother with a hotel, and I found some very comfy seats in a rotunda area. There were lots of servicemen sleeping there, so I felt very safe.

Travelling from Alaska, I’ve had several longer layovers in Seattle in the middle of the night, and I’ve also managed to find some nice places in the Seattle Airport to snooze. On the new concourse, past the International Marketplace, there are several gates with nice flat padded benches. There is also a kids playroom with comfy looking couches, and at 3AM there is never any kids there. The other place is down in baggage claim, all the way past the baggage carousels. There are some more of those flat padded benches, and I’ve snoozed there a few times.

The fee was very reasonable.