Unable to sleep better on weekdays due to busy schedules? Sleeping in on weekends may not only compensate for lost sleep but may reduce your heart disease risk by one-fifth too, according to a study.

"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," said study author Yanjun Song of the State Key Laboratory of Infectious Disease, Fuwai Hospital, Beijing, which is also the National Centre for Cardiovascular Disease.