Originally Posted by iridge

Just did this last week when I went to HND on an inaugural flight. Haneda is a beautiful and very well run airport. If you get there at night, you can get some sleep on the benches on the first floor. Benches are quite comfortable and at night it's not even that noisy as there will be quite a few people just lkie you sleeping there .

The security is very friendly and will not bother you. There are shops, food and message at the airport 24hrs as well

Have fun.