In diligent, exhausted Japan, self-described elite "competitive sleepers" vied to lie down, relax and nap the fastest and deepest in a contest organised by a mattress company. The Tokyo competition, dubbed "Matt Race", saw dozens of participants fitted with sleep-tracking devices sprawl on comfy mattresses to slumber for up to 90 minutes on Monday, competing for the top prize of over two million yen ($14,000).

"Japan is often described as a country suffering from sleep deprivation, and people here are very diligent," Riichiro Nakama, creative director at organiser Koala Sleep Japan, the mattress company. Inside a dimly lit room, participants slept with monitors attached to their heads, some cradling stuffed toys in their beds. "By turning it into an event like this, I think we can get people to sleep together, raise interest in sleep," Nakama said.

OECD data showed in 2021 that Japanese people slept an average of seven hours 24 minutes a day - the least of all OECD nations within the group - with experts citing long working and commuting hours and a busy nightlife economy as among contributing factors. "It was over in an instant. I almost wish I could have slept a little longer," participant Chisato Honda, 32, told "It was a happy competition," he added.

The winner was chosen based on how quickly and soundly they slept. "I want to live on my own, so I think I'll use the money for the moving costs," said Suimii, the contest winner who only gave her nickname. "I also want a bed like a princess's, so I think I'll buy that bed.".