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It's Not Uncommon To See Strangers Sleeping On Shoulders

There are a lot of work-centric customs or traditions on this list, and that's because work is a large part of Japanese culture. Many people in Japan tend to work very long hours, which may be why it's considered normal to see strangers sleeping on others' shoulders during commutes on trains and buses. While the Japanese aren't usually big fans of physical contact, shoulder sleeping is tolerated because people work long hours.

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So, if you happen to be traveling through Japan and you see people sleeping on shoulders, just know that person probably worked a very long day and they're just trying to get what rest they can.