Originally Posted by FTraveler
If you are intent on staying at the airport, you might consider purchasing a refundable DL ticket, go to the DL CRC in Terminal 5 via the underground tunnel from Terminal 6, which is connected by walkway to Terminal 7 where Ted flights usually arrive, which keeps you airside the whole time. At the CRC, show them your ticket and pay $25. You can shower there (shampoo, shower gel, towels, hairdryer - toothbrush kits, shaving kits, brushes and deodorant upon request; have free drinks then walk/stagger to TBIT. CRC stays open until 2330.
The underground tunnels are closed.