Abstract
Objective: Sleep has a significant influence on the incidence of myocardial infarction (MI). The purpose of this study was to investigate the association between sleep timing including bedtime, wake-up time and sleep midpoint, and the incidence of MI.Methods: A total of 4,576 patients (2,065 men, 2,511 women; age 63.4 ± 11.0 years) were selected from the Sleep Heart Health Study. Sleep timings on weekdays and weekends were recorded or calculated based on the sleep habits questionnaire completed by the participants at baseline. Bedtime was divided into 10:00 PM and before, 10:01 PM−11:00 PM, 11:01 PM−12:00 AM, and later than 12:00 AM. Cox proportional hazards regression analysis was used to examine the relationship between sleep timings and MI.Results: Participants with a weekday bedtime later than 12:00 AM, between 11:01 PM−12:00 AM, and 10:00 PM or before had a higher incidence of MI than those with a bedtime between 10:01 PM and 11:00 PM (9.2% vs. 7.0% vs. 6.9% vs. 5.1%, respectively; P = 0.008). Multivariable Cox regression analysis showed that sleeping on weekdays later than 12:00 AM was associated with an increased risk of incident MI after adjusting for potential covariates (hazard ratio, 1.628; 95% confidence interval, 1.092–2.427; P = 0.017). However, there was no significant association between late bedtime on weekends and MI. In addition, no significant association of late wake-up time and delayed sleep midpoint on both weekdays and weekends with the incidence of MI was observed.Conclusion: Sleeping late on weekday (>12:00 AM) independently increased the risk of MI. This finding emphasizes the importance of a proper bedtime for the maintenance of the health of the cardiovascular system.
Highlights
Myocardial infarction (MI) is the most serious manifestation of coronary artery disease, and affects more than 7 million people worldwide each year
Several studies have shown that the sleep timing such as bedtime and wake-up time were correlated with MI risk factors including diabetes mellitus, obesity, and physical activity [10,11,12]
We found a U-sharp relationship between weekday bedtime and MI based on the restricted cubic spline analysis
Summary
Myocardial infarction (MI) is the most serious manifestation of coronary artery disease, and affects more than 7 million people worldwide each year. It is usually defined as myocardial cell death caused by substantial continuous ischemia due to an imbalance between the oxygen supply and demand [1, 2]. Selfreported sleep duration could be calculated as the length of time from bedtime to wake-up time. Several studies have shown that the sleep timing such as bedtime and wake-up time were correlated with MI risk factors including diabetes mellitus, obesity, and physical activity [10,11,12]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
