Sleepless in ... Seattle? Which city gets the least shuteye?

Around the world weary workers are staying late at the office or taking naps on the job - while data reveals the link between sleep and wages

Konomu Suido is a rarity among Tokyo executives: most evenings, he gets home in time to cook dinner with his girlfriend. "There's an expectation in Tokyo that you shouldn't leave work before your boss," he explains. For many of the city's suits, sleep is often fleeting.

It's the same in many cities around the world, with working hours and lengthy commutes encroaching on bedtimes. Sleeplessness seems a particular problem - even a badge of honour - in urban centres of power and innovation, with rest long derided as an opportunity cost by society's leaders. Margaret Thatcher claimed to sleep just four hours a night - now it's Elon Musk defending his 120-hour work weeks, telling Arianna Huffington that sleep is not an option.

We thought: 'sleep takes up a third of our lives, but nobody in economics is looking at it'

There's a chicken-and-egg relationship between sleep and wages - sleep can be both a cause and consequence of income

Some people need to work three jobs. For others, their time is too valuable to take a break. Neither feels they can afford to sleep

Related: The art of the urban nap: let's lose the stigma of public snoozing