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Just send SL residence an e mail and let them know what time you're likely to arrive. Hotels/guesthouses in Thailand almost always have someone there for night shift who can let you into your room. In the highly unlikely event you can't access SL residence, you could just get an affordable room at another hotel. Bangkok is full of hotels and it's pretty much a 24 hour city, easy to grab a taxi, a meal or a beer at any time of night. Don't stress, sabai sabai as the Thai's say.