--- title: Marijuana Linked to Sleepless Nights, Study Finds description: A wake up call from researchers at the University of Pennsylvania finds a history of drug usage, even among quitters, may disrupt a good night's rest canonical: https://time.com/2814282/marijuana-sleep-deprivation/ author: Dan Kedmey article:opinion: false article:content_tier: free article:published_time: 2014-06-02T21:26:25.000Z article:modified_time: 2026-02-21T08:10:25.072Z article:section: Health og:title: Marijuana Linked to Sleepless Nights, Study Finds og:description: A wake up call from researchers at the University of Pennsylvania finds a history of drug usage, even among quitters, may disrupt a good night's rest og:url: https://time.com/2814282/marijuana-sleep-deprivation/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltb0c6be92aaae53b6/69868886810bbb30b5c90cf3/marijuana-pot-weed.jpg?branch=production&width=3840&quality=75&auto=webp&crop=16:9 og:image:width: 1200 og:image:height: 675 og:image:alt: Marijuana leaf og:type: article twitter:card: summary_large_image twitter:title: Marijuana Linked to Sleepless Nights, Study Finds twitter:description: A wake up call from researchers at the University of Pennsylvania finds a history of drug usage, even among quitters, may disrupt a good night's rest twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltb0c6be92aaae53b6/69868886810bbb30b5c90cf3/marijuana-pot-weed.jpg?branch=production&width=3840&quality=75&auto=webp&crop=16:9 ---  # Marijuana Use Can Bring Sleepless Nights, Study Finds  by [Dan Kedmey](https://time.com/author/dan-kedmey/)  ## Dan Kedmey Jun 2, 2014 9:26 PM UTC  MARIJUANA LEAF MARIJUANA LEAFGetty Images  by [Dan Kedmey](https://time.com/author/dan-kedmey/)  ## Dan Kedmey Jun 2, 2014 9:26 PM UTC A [new study](http://www.uphs.upenn.edu/news/News%5FReleases/2014/06/grandner/) has found higher incidences of restlessness and sleep deprivation among marijuana users, upending conventional wisdom that it can help a user relax into a good night’s rest. Researchers at the University of Pennsylvania surveyed the sleep habits of 1,811 former and current marijuana users. The users reported higher rates of sleeplessness and drowsiness compared with nonusers, and the most affected group were participants who started using the drug at an early age. Those who experimented with marijuana before the age of 15 were twice as likely to report severe sleep loss, even if they had cut back on the drug on later in life, a finding that surprised researchers. “As more people have access \[to marijuana\], it will be important to understand the implications of marijuana use on public health, as its impact on sleep in the ‘real world’ is not well known,” said senior author Michael Grandner. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/2814282/marijuana-sleep-deprivation/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/2814282/marijuana-sleep-deprivation/"},"headline":"Marijuana Use Can Bring Sleepless Nights, Study Finds","datePublished":"2014-06-02T21:26:25.000Z","dateModified":"2026-02-21T08:10:25.072Z","description":"A wake up call from researchers at the University of Pennsylvania finds that a history of drug usage, even among quitters, may disrupt a good night's rest","url":"https://time.com/2814282/marijuana-sleep-deprivation/","keywords":["Research","Marijuana","Pot","Weed"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltb0c6be92aaae53b6/69868886810bbb30b5c90cf3/marijuana-pot-weed.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Dan Kedmey","jobTitle":null,"url":"https://time.com/author/dan-kedmey/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltb0c6be92aaae53b6/69868886810bbb30b5c90cf3/marijuana-pot-weed.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Marijuana leaf","caption":"Marijuana leaf","creditText":"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/research/","name":"Research"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/2814282/marijuana-sleep-deprivation/","name":"Marijuana Use Can Bring Sleepless Nights, Study Finds"}}]}] ```