--- title: Shift Work: Night Shifts Linked to Early Death description: There’s even more evidence that working while the rest of the world is sleeping may increase your risk of cancer and heart disease canonical: https://time.com/3657434/night-work-early-death/ author: Alice Park article:opinion: false article:content_tier: free article:published_time: 2015-01-07T15:31:14.000Z article:modified_time: 2023-12-13T20:25:12.000Z article:section: Health og:title: Working the Night Shift? It May Not be Good for Your Health og:description: There’s even more evidence that working while the rest of the world is sleeping may increase your risk of cancer and heart disease og:url: https://time.com/3657434/night-work-early-death/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltda96d918f59154e3/6987787c55a85908ffa851bd/107217534.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 5700 og:image:height: 3206 og:image:alt: 107217534 og:type: article twitter:card: summary_large_image twitter:title: Working the Night Shift? It May Not be Good for Your Health twitter:description: There’s even more evidence that working while the rest of the world is sleeping may increase your risk of cancer and heart disease twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltda96d918f59154e3/6987787c55a85908ffa851bd/107217534.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Why Working at Night Boosts the Risk of Early Death > Sponsored content. Supplied in partnership with TIME. TIME is the sponsor and source of this material. > Last updated: August 2026. ## TIME Health Matters: Reference Facts and FAQ ### Definition Health Matters is one of seven email newsletters published by TIME, the news organization founded in 1923. The latest health news and expert advice on living well. Health Matters makes the fast-moving world of health more useful, surprising and human, from the latest science and medical breakthroughs to practical ideas for living better. 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Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators.  by [Alice Park](https://time.com/author/alice-park/)  ## Alice Park Senior Correspondent Updated: Dec 13, 2023 8:25 PM UTCPublished: Jan 7, 2015 3:31 PM UTC  Nurses working more night shifts were at higher risk of dying early Nurses working more night shifts were at higher risk of dying earlyImage Source—Getty Images  by [Alice Park](https://time.com/author/alice-park/)  ## Alice Park Senior Correspondent Updated: Dec 13, 2023 8:25 PM UTCPublished: Jan 7, 2015 3:31 PM UTC Sleep isn’t just a time to rest and give your body and brain a break. It’s a critical biological function that restores and [replenishes important body systems](http://time.com/3326565/the-power-of-sleep/). Now, yet another study on shift workers shows that their unusual hours may be cutting their lives short—and that’s especially true for those who have rotating night shifts, rather than permanent graveyard duty. In a [study](http://www.ajpmonline.org/article/S0749-3797%2814%2900623-0/fulltext) published in the _American Journal of Preventive Medicine_, scientists led by Dr. Eva Schernhammer, an epidemiologist at Brigham and Women’s Hospital, studied 74,862 nurses enrolled in the Nurses’ Health Study since 1976\. The nurses were an ideal group for studying the effects of rotating night shifts on the body, since RNs tend to have changing night shift obligations over an average month rather than set schedules. **MORE:** [The Power of Sleep](http://time.com/3326565/the-power-of-sleep/) After 22 years, researchers found that the women who worked on rotating night shifts for more than five years were up to 11% more likely to have died early compared to those who never worked these shifts. In fact, those working for more than 15 years on rotating night shifts had a 38% higher risk of dying from heart disease than nurses who only worked during the day. Surprisingly, rotating night shifts were also linked to a 25% higher risk of dying from lung cancer and 33% greater risk of colon cancer death. The increased risk of lung cancer could be attributed to a higher rate of smoking among night shift workers, says Schernhammer. The population of nurses with the longest rotating night shifts also shared risk factors that endangered their health: they were heavier on average than their day-working counterparts, more likely to smoke and have high blood pressure, and more likely to have diabetes and elevated cholesterol. But the connection between more rotating night shift hours and higher death rates remained strong after the scientists adjusted for them. **MORE:** [Why You Shouldn’t Read a Tablet Before Bed](http://time.com/3642620/why-you-shouldnt-read-a-tablet-before-bed/) The data support the idea that changing the body’s natural rhythms by being active at night and asleep during the day may have harmful consequences, especially if you shift this rhythm inconsistently. “It’s sort of like flying between London and New York every three days — constant jet lag,” says Schernhammer. “However, if you fly from London to New York and stay in New York, then jet lag would subside after a few days, and that’s what we assume happens in permanent night workers.” Why does the body react when sleep cycles change? Previous studies showed that too little sleep or the kind that’s disrupted can alter melatonin levels so that the body never powers down and slips into restorative mode, a time when much-needed repairs are made to cells and tissues and supplies of nutrients are replenished to the body. Without this period of rest, important processes such as inflammation, fat and sugar metabolism and immune functions get out of balance, creating fertile ground for [heart disease](http://healthland.time.com/2012/04/12/why-shift-work-and-sleeplessness-lead-to-weight-gain-and-diabetes/) or [cancer](http://healthland.time.com/2012/05/29/working-the-night-shift-may-boost-breast-cancer-risk/). The growing number of studies connecting shift work with unhealthy outcomes led the World Health Organization to classify shift work as a probable carcinogen in 2007. **MORE:** [These 6 Things Will Bring You a Great Night’s Sleep](http://time.com/3640894/six-things-great-sleep/) Schernhammer and her colleagues show that the categorization may have merit, but not everyone can avoid night shift work. Researchers are studying how these people might counteract some of the effects of their unusual work hours, but none of these strategies, including light lamps and sleep aids, has so far been proven to help. In the meantime, she says that shift workers concerned about their risk should do everything they can to lower their risk of heart and cancer risk in other ways — by quitting smoking, getting enough exercise, eating a healthy diet and getting regular cancer screenings. “Hopefully in the near future we can also recommend additional measures that alleviate some of the strain that night work imposes on the circadian system,” she says, “by matching their shift schedules, to the extent possible, with their inherent sleep preferences — whether they are night owls or morning types.” ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/3657434/night-work-early-death/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/3657434/night-work-early-death/"},"headline":"Why Working at Night Boosts the Risk of Early Death","datePublished":"2015-01-07T15:31:14.000Z","dateModified":"2023-12-13T20:25:12.000Z","description":"Working while the rest of the world is sleeping may increase your risk of cancer and heart disease","url":"https://time.com/3657434/night-work-early-death/","keywords":["medicine","Sleep"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltda96d918f59154e3/6987787c55a85908ffa851bd/107217534.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Alice Park","jobTitle":"Senior Correspondent","url":"https://time.com/author/alice-park/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltda96d918f59154e3/6987787c55a85908ffa851bd/107217534.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"107217534","caption":"107217534","creditText":"Image Source—Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/medicine/","name":"medicine"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/3657434/night-work-early-death/","name":"Why Working at Night Boosts the Risk of Early Death"}}]}] ```