Why is the 23rd shorter than the 21st and the 22nd? Why does the data and at midnight (?) between the 23rd and 24th? Why are the lines so curvy? Were there multiple polls per day?

This graph is not in my top-100 of data visualizations.

Napping at the office is something I wish I were able to do (I can’t really fall asleep ‘on demand’). I believe it’s common in Japan to sleep while commuting due to their hostile work culture. In the southern European countries it’s customary to have a mid-day nap, though I don’t know if you’d have at at the office.

Also: Just because they’re symbolising ‘office’ with a desk and chair, that doesn’t mean they expect you to sleep there. But if they showed a dedicated rest room (bad choice of words), no-one would think ‘office’.