From the best night's kip being enjoyed on a Wednesday to rising the earliest on a Sunday, new data is giving fascinating insights into how the world sleeps. Using statistics from Sleep Cycle app users, researchers have discovered that the earliest wake-up time worldwide is on a Monday in South Africa. While on Tuesdays, Americans rise at 7am and are in the worst mood all week. In terms of national average sleep quality, Slovakia topped the list.  The UK was in 45th place, while the US was in 49th. The best sleep quality worldwide occurs on a Wednesday night. More than half (58 per cent) of countries surveyed said they had the most restful sleep on this day . Other countries that wake-up grumpy on Tuesdays include Singapore, Spain, Switzerland, South Africa and Brazil. The Sleep Cycle app tracks a user's sleep as they go through a cycle of sleep phases. It uses the phone's accelerometer to identify phases by tracking movements in bed and wakes users up during their lightest sleep phase, using a pre-defined 30-minute alarm window. It has more than two million active users and gathered data for the study between 1 June 2014 and 31 March this year from users aged 18 to 55 in 47 countries. Other insights from this data include that the best sleep quality worldwide occurs on a Wednesday night. Over the course of the week, people in Finland get the most hours sleep - on a Saturday with eight hours and two minutes, on average. On the same night, people in Japan get an average of just six hours and nine minutes sleep. This graph shows which days of the week countries sleep the most . More than half (58 per cent) of the countries surveyed said they had the most restful sleep on this day, with China recording the highest sleep quality in the world that night. On Thursdays, people in the Middle East wake the latest and the happiest, and in Kuwait, Saudi Arabia and UAE in particular, users also reported the best mood on Thursdays. Despite waking up grumpy on Tuesdays, by Friday the US sleeps in the most and wakes up happiest. The data revealed Americans typically don't rise until 8:24am on Fridays and also report the best wake-up mood. MONDAY: The world wakes up earliest on Mondays with South Africa rising first at 6:09 am . TUESDAY: Americans rise early at 7am and are consequently in the worst mood all week. Other countries that also wake-up grumpy on Tuesdays include Singapore, Spain, Switzerland, South Africa and Brazil . WEDNESDAY: 58% of countries surveyed - including the US - experience sleep best on Wednesdays, with China recording the highest sleep quality in the world that night. THURSDAY: Middle East users sleep longer on Thursdays than any other day, and Kuwait, Saudi Arabia and UAE also report the best mood on Thursdays. FRIDAY: Americans sleep latest on Fridays, not rising until 8:24am. They also report the best wake-up mood. People in Costa Rica, Canada, New Zealand and Sweden also wake up the happiest on Friday. However, the majority of the world (71 per cent), wake up in the best mood on Saturdays. SATURDAY: Nearly 90% of countries surveyed sleep more and wake up later on Saturday compared to any other day of the week. SUNDAY:The majority of the world (66% of countries) spends the least amount of time in bed on Sundays. Topping the list is South Korea where users only sleep 5 hours and 53 minutes on Sunday nights. Also waking up happier on Fridays are people in Costa Rica, Canada, New Zealand and Sweden. However, the majority of the world (71 per cent) wakes up in the best mood on Saturdays. Nearly 90 per cent of countries surveyed sleep more and wake up later on Saturday compared to any other day of the week. While two thirds of countries said they spend least amount of time in bed on Sundays. From waking up at 6:09am to sleeping the least on a Sunday, data has revealed insights into how the world sleeps. Using statistics from the Sleep Cycle alarm app researchers discovered the earliest wake-up time worldwide is on a Monday in South Africa. While on Tuesdays, the US rise at 7am but is in the worst mood . The Sleep Cycle app (pictured) tracks a user's sleep, as they go through a cycle of sleep phases. It has more than two million active users and gathered data for the study between 1 June 2014 and 31 March this year from 941,329 male and female users aged 18 to 55 in 47 countries . Topping the list is South Korea where users only sleep 5 hours and 53 minutes on Sunday nights. Over the course of the week, people in Finland get the most hours sleep - on a Saturday with eight hours and two minutes, on average. On the same night, people in Japan get an average of just six hours and nine minutes sleep. In terms of national average sleep quality, Slovakia topped the list. China was in second place followed by Hungary and the Czech Republic. The UK was in 45th place, while the US was in 49th.
Data was taken from 941,300 male and female Sleep Cycle app users .
It found 6:09am is the earliest wake up time - and this was in South Africa .
Two thirds of countries spend the least amount of time in bed on Sundays .
And 58% of countries experience the best night sleep on Wednesdays .