Cutting back on cannabis was linked to more trouble sleeping—but only in the first two weeks
Young people often say cannabis helps them sleep, and that stopping makes sleeping harder. If that's true, sleep could be one reason treatment is hard to stick with. We wanted to see what actually happened, day by day, while young people were trying to cut back.
Sixty-five people aged 15 to 24 who wanted help reducing their cannabis use answered questions on a handheld device every morning for six weeks while receiving counseling. Each morning they reported how much cannabis they'd used the day before, how long they'd slept, and how much trouble they'd had sleeping.
Two things stood out. Early in treatment—roughly the first two weeks—participants reported less trouble sleeping on days they used more cannabis than their own usual amount, about 14 percent less per additional gram. The flip side is that cutting back was linked to more difficulty sleeping, right at the point when people were working hardest to change. That effect faded: after about day 13, how much someone used stopped predicting their sleep either way, and reported sleep trouble declined steadily across the six weeks.
Second, simply skipping cannabis on a given day wasn't linked to sleep at all—not to how long people slept, not to trouble sleeping. Participants used on about 60 percent of days and rarely went more than a day or two without, so most may not have gone long enough without cannabis for withdrawal-related sleep problems to appear.
One unexpected result: drinking alcohol was tied to shorter sleep across much of the study, more consistently than cannabis was.
What this means in practice
the first two weeks look like the moment to talk with young people about sleep — what to expect, and skills to manage it — rather than waiting for it to come up.
What this doesn't tell us
This is a small study, and everyone in it was already seeking treatment—we can't say whether the same pattern holds for young people who aren't. The data were collected between 2009 and 2012, and both cannabis products and how young people use them have changed considerably since. And because this looks at what people reported day to day rather than testing a sleep treatment, it can't tell us whether helping someone sleep better would reduce their cannabis use.
Parnes JE, LeCavalier KNS, Meisel SN, Miranda R. Dynamic associations between cannabis use and sleep in adolescents and young adults during a cannabis intervention trial. Journal of Research on Adolescence, 2025.
