The lead study author was keen to explain that getting seven hours a night is not a hard and fast rule; some people might need more and others less.
Past studies really only looked at sleep patterns during the week, and recommended that people change their sleeping habits gradually over time. Weekend snoozers, the data showed, live just as long as those who slept enough during the week.
The study found that people who sleep five hours or less per night including the weekends had higher mortality rates.
"Apparently, sleeping in in on the weekends can be a real help", said Åkerstedt, a professor and director of the Stress Research Institute at Stockholm University.
But when the short sleepers slept in on the weekends, their mortality rate did not differ from that of the consistent seven-hour-a-night-ers.
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Not having a sufficient amount of sleep obviously isn't ideal, as it's been linked to having a higher risk of developing conditions such as cancer, diabetes and heart disease. That was true only for those under 65; the mortality difference disappeared for people who were older.
Inadequate sleep has always been proven as a trigger and cause for mental and physical illnesses and even leading to an early death.
So when Saturday morning rolls around, go ahead and turn off your alarm clock - it's for your own good.
We often hear about how the most successful people wake up early and get a jump start on their day before the sun is up. Monday was found to be the day of the week when people feel the least energetic. "People can not learn to live on insufficient sleep and they may not be aware of their reduced cognitive abilities".