acute sleep deprivation.
There's a increasing number of Japanese companies who encourage their workers to sleep on the job. They figure that if their staff can grab a few twenty minute power naps a day, they'll be even more productive.
And most workers, keen to show their bosses how committed they are to the company, adopt the practice of 'Inemuri' which literally means 'sleeping while present'.
Some workers even pretend to be practising Inemuri in order to show their bosses they are working hard. But there's an etiquette to Inemuri. The worker is supposed to remain upright.
If they can...