--- title: Interrupted Sleep is as Harmful as No Sleep at All, a New Study Finds description: A study conducted by researchers at Tel Aviv University proves that fragmented sleep is as physically detrimental as having no sleep at all canonical: https://time.com/2968392/study-interrupted-sleep-may-be-as-harmful-as-no-sleep-at-all/ author: Melissa Hellmann article:opinion: false article:content_tier: free article:published_time: 2014-07-09T09:54:13.000Z article:modified_time: 2026-02-21T09:02:13.983Z article:section: Health og:title: Interrupted Sleep is as Harmful as No Sleep at All, a New Study Finds og:description: A study conducted by researchers at Tel Aviv University proves that fragmented sleep is as physically detrimental as having no sleep at all og:url: https://time.com/2968392/study-interrupted-sleep-may-be-as-harmful-as-no-sleep-at-all/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltbbc11cda07eec148/69869afc3bc9993f361a4718/72818730.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 3000 og:image:height: 1688 og:image:alt: Sleep Medicine Booms In The United States og:type: article twitter:card: summary_large_image twitter:title: Interrupted Sleep is as Harmful as No Sleep at All, a New Study Finds twitter:description: A study conducted by researchers at Tel Aviv University proves that fragmented sleep is as physically detrimental as having no sleep at all twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltbbc11cda07eec148/69869afc3bc9993f361a4718/72818730.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Study: Interrupted Sleep May Be as Harmful as No Sleep at All > Sponsored content. 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Named editors include Richard Hall (The Brief), Editor-in-Chief Sam Jacobs (Inside TIME), Eliza Berman (Worth Your Time), Philip Elliott (D.C. Brief), Justin Worland (Future Proof) and Harry Booth (In the Loop). Health Matters is written by TIME's health desk. #### How do I sign up for a TIME newsletter? Go to time.com/newsletters, choose the newsletters you want and enter your email address. There is no cost and no subscription requirement. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-network-2026q3/newsletters?i=4b8d8a92-dc8e-4d51-8813-58648615bb81&cr=time-nl-network-2026q3-v1) by [Melissa Hellmann](https://time.com/author/melissa-hellmann/) ## Melissa Hellmann Jul 9, 2014 9:54 AM UTC  Ryan Gamble has wires applied to his head by lab technologist Amy Bender in preparation for a polysomnographic recording system demonstration at Washington State University Spokane's Sleep and Performance Research Center December 13, 2006 in Spokane, Washington. Ryan Gamble has wires applied to his head by lab technologist Amy Bender in preparation for a polysomnographic recording system demonstration at Washington State University Spokane's Sleep and Performance Research Center December 13, 2006 in Spokane, Washington. Jeff T. Green—Getty Images by [Melissa Hellmann](https://time.com/author/melissa-hellmann/) ## Melissa Hellmann Jul 9, 2014 9:54 AM UTC Fragmented sleep could be as physically [harmful](http://www.universityherald.com/articles/10300/20140708/interrupted-sleep-may-be-as-detrimental-as-no-sleep.htm) as a total lack of sleep, according to an unprecedented study. Lead researcher Prof. Avi Sadeh and his team at Tel Aviv University found that an interrupted night of sleep — which is common for doctors and new parents — is similar to having only four hours of consistent sleep. The experiment published in the [journal](http://www.sleep-journal.com/) _Sleep Medicine_ studied the sleep patterns of students using wristwatches that monitored when they were asleep or awake. Students slept a full eight-hours one night followed by a night of interrupted sleep in which they received four phone calls directing them to complete a brief computer exercise before returning to bed. The morning after both nights, the volunteers completed tasks to measure their attention span and emotional state — results proved that just one night of interrupted sleep had negative effects on mood, attention span and cognitive ability. Sadeh believes that several nights of fragmented sleep could have long-term negative consequences equivalent to missing out on slumber altogether. “We know that these effects accumulate and therefore the functional price new parents — who awaken three to ten times a night for months on end — pay for common infant sleep disturbance is enormous,” he said in a statement. The study also acknowledged that many people of varying ages and professions are susceptible to fragmented sleep — a finding that Sadeh hopes will provide an impetus for creating solutions. “I hope that our study will bring this to the attention of scientists and clinicians, who should recognize the price paid by individuals who have to endure frequent night-wakings,” Sadeh said. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/2968392/study-interrupted-sleep-may-be-as-harmful-as-no-sleep-at-all/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/2968392/study-interrupted-sleep-may-be-as-harmful-as-no-sleep-at-all/"},"headline":"Study: Interrupted Sleep May Be as Harmful as No Sleep at All","datePublished":"2014-07-09T09:54:13.000Z","dateModified":"2026-02-21T09:02:13.983Z","description":"Just one night of interrupted sleep negatively affected mood, attention span and cognitive ability","url":"https://time.com/2968392/study-interrupted-sleep-may-be-as-harmful-as-no-sleep-at-all/","keywords":["Research","Sleep","Science topic","health","Mental Health/Psychology"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltbbc11cda07eec148/69869afc3bc9993f361a4718/72818730.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Melissa Hellmann","jobTitle":null,"url":"https://time.com/author/melissa-hellmann/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltbbc11cda07eec148/69869afc3bc9993f361a4718/72818730.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Sleep Medicine Booms In The United States","caption":"Sleep Medicine Booms In The United States","creditText":"Jeff T. 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