Circadian rhythms in cardiovascular disease https://academic.oup.com/eurheartj/article/46/36/3532/8202919 Heart attacks occur ~ three times more frequently in the morning than in the late evening ⟿ https://www.derstandard.at/story/3000000301384/warum-herzinfarkte-montagfrueh-am-haeufigsten-sind-und-wie-man-gegensteuern-kann Monday morning heart attacks https://www.health.harvard.edu/heart-health/how-the-bodys-internal-clocks-influence-heart-health Social Jetlag as a cause. Social jetlag describes the discrepancy between the biological clock (the internal rhythm) and the social clock (mandatory times for work, school), which leads to chronic sleep disturbance, similar to jetlag after travel