Sleeping Late Increases the Risk of Myocardial Infarction in the Middle-Aged and Older Populations

Yajuan Fan; Yanhua Wu; Yuan Peng; Binbin Zhao; Jian Yang; Ling Bai; Xiancang Ma; Bin Yan

doi:10.3389/fcvm.2021.709468

Sleeping Late Increases the Risk of Myocardial Infarction in the Middle-Aged and Older Populations

Front Cardiovasc Med. 2021 Sep 24:8:709468. doi: 10.3389/fcvm.2021.709468. eCollection 2021.

Authors

Yajuan Fan¹, Yanhua Wu², Yuan Peng¹, Binbin Zhao¹, Jian Yang^{1

2}, Ling Bai³, Xiancang Ma¹, Bin Yan^{1

2}

Affiliations

¹ Department of Psychiatry, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
² Department of Clinical Research Centre, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
³ Department of Cardiology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.

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.

Keywords: bedtime; myocardial infarction; sleep heart health study; sleep midpoint; wake-up time.