The Truth About Sleeping

A Canadian study, published today in the medical journal Sleep, tested 276 adults between 21 and 64 years of age. They tested short and long duration sleepers. They found that 35 per cent and 25 per cent are more likely to gain 5kg (11lb) compared with average duration sleepers who maintained 7 hours sleep.

Short sleepers gained 1.98kg (4.3lb) while long sleepers gained 1.58kg (3.4lb).

The risk of developing obesity increases more than 27 percent for over sleepers.

Previous research suggested that sleep loss could disturb the production of hormones that control the desire for calorie rich foods. The level of ghrelin, the hormone released by the stomach to signal hunger, was 15 per cent higher in people who sleep five hours compared to those getting eight hours.

Lack of sleep leads to tiredness during the day, which reduces the level of physical activity.

The alarming statistics are for those who lack sleep. People who sleep five or fewer face a 70 per cent risk of dying from all causes - and twice the risk of death from a cardiovascular disease.

Professor Jim Horne, director of the Sleep Research Centre at Loughborough University, said those whose sleeping habits exceed seven hours, or who regularly get less, should not despair. They are not at risk.

"There is a great deal of evidence now that sleeping less than five hours a night is linked with putting on weight," he said, "but it's a very slow weight gain over a number of years."

So, enjoy a full night’s sleep.