Fun fact is that in Thailand, the hotels are required to log and keep the government IDs of all "guests" that could potentially stay overnight. They will then call your room to ask if you are expecting a "guest" and only if you say yes, they will allow the individual and only that individual up to your room. This is actually for the guest's protection and will not reveal the worker's name either. When they leave, the guest gets to take their ID back.
