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It may seem obvious, but a survey says people who get a good night's sleep are happier with their lot in life.
The Australian Unity Wellbeing Index has found that people who sleep for less than six hours a night have lower wellbeing levels compared to those who got seven to nine hours sleep.
But levels of satisfaction dropped off when people slumbered for more than 10 hours a night, according to the survey of 2,000 Australians.
Overall, about 30 per cent of people surveyed slept for seven hours or less a night, while two thirds sleep between seven to nine hours.
University of Sydney sleep medicine Professor Ron Grunstein says it's important to determine whether the lack of sleep is leading to lower wellbeing, or whether symptoms such as stress and anxiety are causing people to toss and turn.