LONDON - Fatal heart attacks are most likely to happen on Mondays, new research has found.

Scientists who studied 10,528 patients admitted to hospital in Ireland with a serious heart attack over a five-year period found that rates were 13% higher on Mondays.

They concluded that the body’s natural sleep-wake cycle is disrupted over the weekend as people stay up late or enjoy a lie-in and then, when people return to their usual weekday rising time, it causes higher levels of inflammation and stress hormones that can trigger heart attacks.