Although the differences in human behavior while staying in a hotel room appear to have been established and are distinctive, little is known about the underlying factors that drive these changes, particularly in relation to environmental sustainability. Through in-depth interviews with 43 tourists, this study identified three degrees of unusual behavior in hotels: nearly completely unusual, transitional, and approximately usual. Using a grounded theory approach, we developed a "habitus-environment" model that explains how tourists change their behavior in response to unusual environmental sti...