--- title: "Sleep duration and risk of all-cause mortality: a systematic…" description: "Sleeping more than 9 hours per night is associated with an increased risk of all-cause mortality, but this might be due to underlying health issues." url: "https://magellanlongevity.com/study/sleep_mortality.md" canonical: "https://magellanlongevity.com/study/sleep_mortality.html" html: "https://magellanlongevity.com/study/sleep_mortality.html" type: "study" study_key: "sleep_mortality" journal: "Epidemiology and Psychiatric Sciences" year: 2018 pmid: "30058510" doi: "10.1017/S2045796018000379" citations: 1 updated: 2026-09-02 author: "Gabriel Radu, DO" author_credentials: "Physiatrist (PM&R). NY medical license 275110. NPI 1376861765." publisher: "Magellan Longevity" content_format: "markdown" --- # Sleep duration and risk of all-cause mortality: a systematic review and meta-analysis. [Home](https://magellanlongevity.com/) › [Research map](https://magellanlongevity.com/longevity-research-map.html) › Sleep duration and risk of all-cause mortality: a… **HTML version:** https://magellanlongevity.com/study/sleep_mortality.html · **In the Magellan app:** https://magellanlongevity.com/#/study/sleep_mortality ## Citation | Field | Value | | --- | --- | | Journal | Epidemiology and Psychiatric Sciences | | Year | 2018 | | PMID | [30058510](https://pubmed.ncbi.nlm.nih.gov/30058510/) | | DOI | [10.1017/S2045796018000379](https://doi.org/10.1017/S2045796018000379) | | Study key | sleep_mortality | ## Takeaway Sleeping more than 9 hours per night is associated with an increased risk of all-cause mortality, but this might be due to underlying health issues. ## The question What is the association between sleep duration and the risk of all-cause mortality in adults? ## Hypothesis The study aimed to determine the association between sleep duration and all-cause mortality, with planned comparisons of sleep durations less than 7 hours and greater than 9 hours against a reference of 7-9 hours. ## Methods A systematic review and meta-analysis of cohort studies were conducted using MEDLINE, CENTRAL, EMBASE, and LILACS databases, along with other databases and unpublished literature. The risk of bias was assessed using a modified Cochrane Collaboration's tool. A random effects analysis was performed, with all-cause mortality as the primary outcome and risk difference (RD) with 95% confidence intervals as the effect measure. Comparisons were made between 9 hours of sleep versus 7-9 hours. ## Results Thirty-nine studies were included in the qualitative analysis. For quantitative analysis, 19 studies compared 9 hours to 7-9 hours. Most studies showed a low risk of bias. The overall risk difference for all-cause mortality was 0.09 (95% CI 0.07-0.11) when comparing the >9 hours group to the 7-9 hours reference, favoring the reference group. No significant difference was found between the <7 hours group and the 7-9 hours reference group (RD 0.00, 95% CI 0.00-0.01). ## Conclusion There is a probable association between long sleep duration (>9 hours) and higher all-cause mortality. However, no significant association was found for short sleep duration (<7 hours) compared to the 7-9 hour reference. ## Limitations The observed association between long sleep duration and higher mortality might reflect underlying systemic or neurological diseases that cause sleep fragmentation, deterioration in quality, and micro-awakenings, rather than long sleep duration itself being a direct cause. ## Verbatim from the abstract > Both short and long sleep duration were associated with an increased risk of all-cause mortality in this meta-analysis. ## Risk Difference for All-Cause Mortality by Sleep Duration | Measure | Risk Difference | | --- | --- | | >9 hours vs. 7-9 hours | 0.09 | | <7 hours vs. 7-9 hours | 0 | *The risk difference (RD) for all-cause mortality when comparing sleep durations to a 7-9 hour reference. A positive RD indicates higher mortality in the compared group.* ## Where this study is used on Magellan This paper is one of the citations behind the evidence grade on the pages below. Grades are assigned from the published research and are independent of affiliate commissions. | Compound or device | Evidence grade | Graded pages | | --- | --- | --- | | Sleep Optimization & Circadian Systems | — | — | | Blue-Light Management & Circadian Lighting | Tested — did not work | [SYB Clear Blue Light Glasses](https://magellanlongevity.com/p/58.md) | | Nasal-Breathing Sleep Tape | — | — | | Biometric Wearables (Sleep, HRV & Recovery) | Measurement tool | [Garmin Forerunner 265](https://magellanlongevity.com/p/65.md), [Oura Ring Gen 4](https://magellanlongevity.com/p/61.md), [Apple Watch Series 11](https://magellanlongevity.com/p/63.md) | | Neurofeedback & Stress-Resilience Devices | — | — | ## Reference 1. **Sleep duration and risk of all-cause mortality: a systematic review and meta-analysis.** Epidemiology and Psychiatric Sciences 2018 · [PMID 30058510](https://pubmed.ncbi.nlm.nih.gov/30058510/) · [DOI 10.1017/S2045796018000379](https://doi.org/10.1017/S2045796018000379) > Both short and long sleep duration were associated with an increased risk of all-cause mortality in this meta-analysis. ## Structured data ```json {"@context":"https://schema.org","@graph":[{"@type":"MedicalWebPage","@id":"https://magellanlongevity.com/study/sleep_mortality.html#page","url":"https://magellanlongevity.com/study/sleep_mortality.html","name":"Sleep duration and risk of all-cause mortality: a systematic review and meta-analysis.","description":"Sleeping more than 9 hours per night is associated with an increased risk of all-cause mortality, but this might be due to underlying health issues.","inLanguage":"en","isPartOf":{"@type":"WebSite","name":"Magellan Longevity","url":"https://magellanlongevity.com/"},"author":{"@type":"Person","name":"Gabriel Radu, DO","jobTitle":"Physiatrist (PM&R)","identifier":[{"@type":"PropertyValue","name":"NPI","value":"1376861765"},{"@type":"PropertyValue","name":"NY medical license","value":"275110"}]},"publisher":{"@type":"Organization","name":"Magellan Longevity","url":"https://magellanlongevity.com/"},"encoding":{"@type":"MediaObject","encodingFormat":"text/markdown","contentUrl":"https://magellanlongevity.com/study/sleep_mortality.md"},"dateModified":"2026-09-02"},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://magellanlongevity.com/"},{"@type":"ListItem","position":2,"name":"Research map","item":"https://magellanlongevity.com/longevity-research-map.html"},{"@type":"ListItem","position":3,"name":"Sleep duration and risk of all-cause mortality: a…","item":"https://magellanlongevity.com/study/sleep_mortality.html"}]},{"@type":"ScholarlyArticle","@id":"https://magellanlongevity.com/study/sleep_mortality.html#study","name":"Sleep duration and risk of all-cause mortality: a systematic review and meta-analysis.","headline":"Sleep duration and risk of all-cause mortality: a systematic review and meta-analysis.","datePublished":"2018","isPartOf":{"@type":"Periodical","name":"Epidemiology and Psychiatric Sciences"},"identifier":"PMID:30058510","url":"https://pubmed.ncbi.nlm.nih.gov/30058510/","sameAs":"https://doi.org/10.1017/S2045796018000379","abstract":"Sleeping more than 9 hours per night is associated with an increased risk of all-cause mortality, but this might be due to underlying health issues."}]} ``` ## Related on Magellan Longevity - [Garmin Forerunner 265](https://magellanlongevity.com/p/65.md) — product graded on this and related evidence - [Oura Ring Gen 4](https://magellanlongevity.com/p/61.md) — product graded on this and related evidence - [Apple Watch Series 11](https://magellanlongevity.com/p/63.md) — product graded on this and related evidence - [SYB Clear Blue Light Glasses](https://magellanlongevity.com/p/58.md) — product graded on this and related evidence - [Systematic review of light exposure impact on human circadian rhythm.](https://magellanlongevity.com/study/bluelight.md) - [Self-Reported Sleep Duration and Quality and Cardiovascular Disease and Mortality: A…](https://magellanlongevity.com/study/x19.md) - [Longevity research map](https://magellanlongevity.com/longevity-research-map.html) - [Evidence-based longevity supplements](https://magellanlongevity.com/longevity-supplements.md) ## Scope and disclosures Educational information, not medical advice. Nothing here is intended to diagnose, treat, cure, or prevent any disease. Talk to your physician before starting any supplement or device, especially if you are pregnant, nursing, or taking medication. Editorial firewall: evidence grades are assigned from the published research and are independent of any affiliate commission. As an Amazon Associate, Magellan Longevity earns from qualifying purchases. Reviewed for accuracy by a board-certified physician (DO).