This hotel has Hotsprings! Located within the Airport! Amazing idea! Loved it!
After I arrived from Canada connecting through Narita Airport, especially when the flight to Chitose got delayed about 1.5hr, this was just such a sweet treat for me.
I know that their rooms might look too small for non Japanese people, but I still think you'd get to relax there if you don't expect much. Even if you don't want to spend cash to stay in a room, you could also pay for the hotsprings only(1500JPY for hotsprings, Yukata and towels) and just stay in the relaxation room and sleep in the long chair there -pic shown- (if you don't snore too loud ;) Just be careful that they have a midnight fee on top of the regular rate after 0:00 or 1:00am. I don't think it's that much tho.
Mostly (buffet) breakfast included if you're ok with Japanese food.
I wanted to go shop around the mall next day which is also within the airport, but we didn't have time.
Here's the website, sorry no English..yet I guess.