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Chronobiology International
The Journal of Biological and Medical Rhythm Research
Volume 32, 2015 - Issue 4
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Short Communication

The effects of chronic marijuana use on circadian entrainment

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Pages 561-567 | Received 19 Jul 2014, Accepted 31 Dec 2014, Published online: 24 Mar 2015
 

Abstract

Animal literature suggests a connection between marijuana use and altered circadian rhythms. However, the effect has not yet been demonstrated in humans. The present study examined the effect of chronic marijuana use on human circadian function. Participants consisted of current users who reported smoking marijuana daily for at least a year and non-marijuana user controls. Participants took a neurocognitive assessment, wore actigraphs and maintained sleep diaries for three weeks. While no significant cognitive changes were found between groups, data revealed that chronic marijuana use may act as an additional zeitgeber and lead to increased entrainment in human users.

Declaration of interest

There are no conflicts of interest on the part of the researchers.

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