Sleep has had an image problem in the business world, but some firms are now investing in a better-rested workplace, reports The Guardian.

One of the more annoying habits of highly successful people is their tendency to advertise how little sleep they need. Former Yahoo boss Marissa Mayer can operate on four hours, Apple CEO Tim Cook is at the gym by 5am and designer and film director Tom Ford gets three hours a night, and keeps Post-it notes by his bed in case he wakes up with an idea.

Stealing an extra 20 minutes in bed in the morning is practically taboo in the world of high-stakes business, where snoozing has long been equated with losing.

Arianna Huffington has been on a mission to destigmatise sleep after collapsing from exhaustion 10 years ago.