Scientists analysing data collected from a smartphone app have been able to determine sleeping patterns the world over and have published their findings in the journal Science Advances.
It showed the Dutch have nearly an hour more in bed every night than people in Singapore or Japan.
New Zealanders and Australians get some of the most sleep of the 20 countries studied, averaging about 8.1 hours per night.
The study also found that women routinely get more sleep than men, with middle-aged men getting the least of all.
The research team at the University of Michigan released the Entrain app in 2014 to help people overcome jetlag but users could choose to share data on their sleeping habits with the research group allowing the study to take place.