Where to Sleep
Busy airport with many overnight travellers but the airport is sleep-friendly with good amount of seating and some private, quieter spots.
Visit the Observation Deck on the 4th floor (follow signs for Airline Passenger Services) for less air conditioning, so you won’t be cold at night. It’s a quiet area with a few semi-comfortable benches.
On B floor, there are a few quiet seats next to the Subway and 7-Eleven; these fill up quickly.
Also on B floor, many folks gather under the stairways for quiet - but the floor is cold so have something to lie on. (This is the entry for the local train, which is closed from 1-6am so it’s quieter here.)
The area near the International Zone’s prayer room has comfortable couches (Traveller, February 2016).
For uninterrupted sleep, there are sleep boxes and a transit hotel inside the airport. See Airport Hotels in the airport guide below.