I was thinking about something similar, but not strictly a "no show". I have a trip planned where I am going home on a red eye flight and rather than fend for myself during the evening, I wouldn't mind having a hotel room for 1/2 a day as a "home base" for a little nap and maybe dinner. Yes, I'd of course also like to get an extra FFN credit in the process.
I'm not sure if I'd get FFN credit if I checked in at 3:00 PM and checked out at ~9:00 PM the same day, so I'd rather do it by phone (or whatever) the next morning, if possible.
FF