According to new research by Dr David Snashall, of the department of occupational medicine at Guy's and St. Thomas' Hospital London, long working hours and lack of sleep doubles the risk of heart attacks.

Dr Snashall followed 260 men aged between 40 and 79 who had survived a first heart attack. They were compared with 445 men without heart problems. The results showed male heart attack victims spent much more time at work and had less sleep.

Men working 60 or more hours were at twice the risk of men working fewer than 40 hours. Similarly, getting less than five hours sleep for two or more nights a week trebled their risk of a heart attack.

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