Heart Attack More Likely Happen on Monday, Study Reveals

The same effect is seen in the event rate of strokes. Previous studies have also shown a higher rate of heart attacks in the days following the clocks going forward for daylight savings time.

"The exact mechanism for these variations is unknown but we presume it has something to do with how the circadian rhythm affects circulating hormones that can influence heart attacks and strokes," he explained.

He added: "It is likely to be due to the stress of returning to work. Increased stress leads to rising levels of the stress hormone cortisol, which is linked to a higher risk of heart attack,"