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In Japan, work culture is so intense that sleep has traditionally been viewed as more of a luxury than a necessity. A study last year, estimated that, on average, workers in Japan did 200 hours of overtime each year.

One company has decided to take action to encourage its employees to get more sleep. A wedding-planning business called Crazy is offering bonuses of more than $500 a year if employees can prove they have consistently got at least six hours’ sleep on work nights. The Â鶹Éç's Paul Henley has been speaking to Professor Seijiro Takeshita who is Dean of the School of Management and Information at the University of Shizuoka.

(Photo shows: A Japanese woman asleep at her laptop. Credit: Getty Images)