Does more sleep reduce your chance of death from cardiovascular events and other causes?

Question:

How much sleep is associated with the lowest risk of all-cause mortality and cardiovascular disease-related events and mortality?

Conclusion:

The lowest-risk duration of sleep is 7 hours per day. Both longer and shorter sleep durations were associated with increased risk of all-cause mortality and cardiovascular disease-related mortality.

Process:

  • 67 of 1436 studies qualified for analysis
  • All studies were prospective
  • Study quality ranked on a 9-point scale; average rating was 7

Analysis:

  • Populations were generally healthy (not already diagnosed with heart disease or stroke)
  • All studies had 3 categories of sleep duration (best amount, too little, too much)
  • Measures: all-cause mortality and events and mortality related to: cardiovascular disease, coronary heart disease, stroke

Results:

Risk of mortality and cardiovascular events, based on difference from 7-hours of sleep per day:

  • Risk from the shortest amounts of sleep
    • 13% increased risk for all-cause mortality
    • 14% increased risk for cardiovascular disease-related events and mortality
    • 22% increased risk for coronary artery disease-related events and mortality
    • Stroke (no significant findings)
  • Risk from the longest amounts of sleep
    • 35% increased risk for all-cause mortality
    • 36% increased risk for cardiovascular disease-related events and mortality
    • 21% increased risk for coronary artery disease-related events and mortality
    • 45% increased risk for stroke-related events and mortality

Risk of mortality and cardiovascular events based on each hour difference from 7-hours of sleep per day:

  • For each hour less than 7
    • 6% increased risk for all-cause mortality
    • 6% increased risk for cardiovascular disease-related events and mortality
    • 7% increased risk for coronary artery disease-related events and mortality
    • 5% increased risk for stroke-related events and mortality
  • For each hour more than 7
    • 5% increased risk for all-cause mortality
    • 5% increased risk for cardiovascular disease-related events and mortality
    • 5% increased risk for coronary artery disease-related events and mortality
    • 5% increased risk for stroke-related events and morality

Other Information:

  • Studies do not measure quality of sleep
  • The follow-up periods to track patients weren’t specified in the review
  • Most studies occurred before wearable sleep tracking devices (e.g. Fitbits) were invented, so data was reported by patients
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