Health
Sleep Alert: How One Habit May Increase Heart Attack and Stroke Risk by 26%
As children, many of us had set bedtimes dictated by our parents, ensuring we got the rest we needed. However, as adults, we have the freedom to choose our own sleep schedules. Despite this autonomy, maintaining a consistent sleep routine might be more beneficial than we realize. A recent study suggests that varying your sleep and wake times could significantly increase your risk of serious cardiovascular issues, such as heart attacks and strokes.
The study, published in the Journal of Epidemiology & Community Health, investigated the sleep patterns of 72,269 individuals aged 40 to 70. These participants were part of the UK Biobank study and wore activity trackers for a week to monitor their sleep. The data collected was used to calculate each participant’s Sleep Regularity Index (SRI) score, which measures the consistency of sleep-wake patterns across consecutive days.
Participants were categorized based on their SRI scores: those scoring over 87 were considered regular sleepers, scores between 72 and 87 indicated moderately irregular sleepers, and scores below 72 were classified as irregular sleepers. Interestingly, regular sleepers were more likely to achieve the recommended seven to nine hours of sleep per night for adults under 65, and seven to eight hours for those over 65.
Over the following eight years, researchers compared these sleep regularity scores with the incidence of cardiovascular events and related deaths. The findings were striking. Irregular sleepers had a 26% increased risk of experiencing major cardiovascular events compared to their regular sleeping counterparts. Even those who were moderately irregular faced an 8% higher risk.
The study authors noted, “Our results suggest that sleep regularity may be more relevant than sufficient sleep duration in modulating MACE [major adverse cardiovascular event] risk.” This implies that even if one gets the recommended amount of sleep, irregular sleep patterns can still pose a significant health risk.
In a press release, the researchers emphasized the importance of sleep consistency in public health guidelines and clinical practices, highlighting its potential impact on cardiovascular health. Lead study author Jean-Philippe Chaput, PhD, from the University of Ottawa, shared with CNN that while exact sleep and wake times aren’t necessary, staying within 30 to 60 minutes of your usual schedule is beneficial.
“Small variations are fine, but consistent sleep patterns improve sleep quality, boost mood and cognitive function, and lower the risk of health issues like heart disease and diabetes,” Chaput explained.
Despite its compelling findings, the study did have limitations. The authors pointed out that it was observational, meaning it could not establish a direct cause-and-effect relationship. Sleep was only monitored for one week, which might not provide a complete picture of long-term patterns. Additionally, the data may not fully represent the broader UK population, and the activity trackers used could not distinguish between quiet wakefulness and sleep or account for napping in the SRI scores.
Overall, this research underscores the importance of maintaining a regular sleep schedule for cardiovascular health, suggesting that consistency in sleep might be as crucial as the amount of sleep itself.
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