Novotel Bangkok Suvarnabhumi Airport
Located in the airport complex itself, the Novotel has no set check-in time, so you can check in any time of day or night and check out 24 hours later. Amenities include four restaurants, a pool, a gym, and a spa. You can also book a shower at the fitness center from 6 am to 9:30 pm for B750 or a day pass for the fitness center and swimming pool during the same hours for B800.