Sleepbox
I prefer the MVP I've been using in airports for years:  - hoodie
  - ipod with white noise
  - mindfold mask (mindfold.com)
  - inflatable neck pillow
  - backpack with strap wrapped around my arm
  - empty gate of any soon-to-be-bankrupt airline

It's already paid for, it works great (the mindfold is the secret, believe me), it weighs less that a pound, and I can use it on the plane too.