One of the things I found most surprising about Japan was that every hotel provides pyjamas. The PJs are usually laid out neatly on top of the bed, rather than tucked away in a wardrobe like robes and slippers often are in Western hotels. According to Google, this is done for a mix of cultural, practical and hospitality reasons. You can look that up for yourselves. We found that pyjamas were provided in both traditional Japanese hotels and Western-style chains. In every case,