In most countries, sleeping on the job isn’t just frowned upon, it may get you fired.

But in Japan, napping in the office is common and culturally accepted. And in fact, it is often seen as a subtle sign of diligence: You must be working yourself to exhaustion.

The word for it is “inemuri.” It is often translated as “sleeping on duty,” but Brigitte Steger, a senior lecturer in Japanese studies at Downing College, Cambridge, who has written a book on the topic, says it would be more accurate to render it as “sleeping while present.”

That, she said, captures Japan’s approach to time, where it’s seen as possible to do multiple things simultaneously, if at a lower intensity. So you can get credit for attending that boring quarterly sales meeting while also dreaming of a beach vacation.

Inemuri is most prevalent among more senior employees in white-collar professions, Dr. Steger said. Junior employees tend to want to stay awake all day and be seen as energetic, and workers on assembly lines can’t just nod off.