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35-Year Study Challenges Belief That Cannabis Improves Sleep

Interestingly, participants' own assessments did not reveal the same association, suggesting subjective perceptions may differ from objective measurements.

,   and  TIPP Staff
2 min read
A 35-year study challenges the belief that marijuana is good for sleep. Pic via(@nypost)

A 35-year study by Northwestern Medicine has challenged the belief that cannabis improves sleep, finding that both recent and long-term use are associated with poorer sleep quality.

Published in JAMA Network Open in October 2026, the research followed participants who entered the study in 1985 and 1986, when they were aged 18 to 30. Researchers assessed cannabis use over time and used wrist-mounted trackers and sleep diaries to measure sleep patterns.

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Each additional year of cannabis use was associated with higher odds of fragmented sleep, reduced sleep efficiency and increased time spent awake after initially falling asleep. Recent users also showed greater odds of sleep disruption than people who had never used cannabis.

Interestingly, participants' own assessments did not reveal the same association, suggesting subjective perceptions may differ from objective measurements.

Researchers acknowledged limitations, including the lack of information about cannabis potency, consumption methods and timing. The findings do not support cannabis as a reliable sleep aid.

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