Sudden Cardiac Arrest -- Heart Rhythm -- Chugh (IMAGE) Cedars-Sinai Medical Center Caption Heart experts have long believed that weekday mornings -- and especially Mondays -- were the danger zones for unexpected deaths from sudden cardiac arrests. But a new Cedars-Sinai study shows those peak times have disappeared and now, sudden cardiac arrests are more likely to happen on any day at any time. Credit Getty Images Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.