That's why I think the MetroNap pods might work better at an airport. No sheets and according to the website, the cover is heavy-duty vinyl that can be easily cleaned.
How long do people hang out at airports, anyway (I am saying on a normal travel day, not with cancelled flights and so on). Janice mentioned at 3.5 hour layover in Minneapolis. I can remember various trips where I had about 2 hours to wait--long enough for a nap, not long enough for full-fledged sleep.
L