There’s a ton of public space in Tokyo. To me this reads as: - people pay for car sharing (generally it requires a monthly fee plus a small usage fee per hour)

There’s a ton of public space in Tokyo. To me this reads as: - people pay for car sharing (generally it requires a monthly fee plus a small usage fee per hour) - occasionally people that already pay the monthly fee take advantage of a nearby available car to sit in or nap in. This isn’t a widespread trend where public space is so limited one needs to rent a car to sit in. The napping explanation is probably the most common. It’s normal to see people napping in vehicles at midday, especially delivery drivers and construction workers. I can see the appeal of hopping in a nearby car-share car to nap as it would be more comfortable than the seating one can normally find.