Lie-ins at the weekend can prevent heart disease.
A study of 90,000 adults in Britain found those who caught up on their sleep on Saturday and Sunday mornings were at "significantly" less risk of the cardiac condition.
Participants were tracked over a period of 14 years with devices employed to monitor sleeping habits and self-reported records of sleep deprivation, which were then compared with hospital records and death registry information.
The people were separated into four different groups depending on how much "compensatory sleep" they got at the weekend and those with the most had a 20 per cent reduced risk of heart disease.
Yanjun Song, co-author of the study at the State Key Laboratory of Infectious Disease in Beijing, said: "Sufficient compensatory sleep is linked to a lower risk of heart disease.
"The association becomes even more pronounced among individuals who regularly experience inadequate sleep on weekdays."