Why Is Sleep Important?

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Healthy sleep is essential for memory, learning, brain health, and physical health.

Objective sleep studies do not show that cannabis generates refreshing sleep, even when users report benefits.

THC and CBD are not approved by the FDA and have not demonstrated convincing efficacy for chronic insomnia.

Nightly THC taken for sleep can produce tolerance, withdrawal insomnia, and cannabis use disorder.

Sleep is an active biological process that keeps the brain and body healthy. Yet, according to the CDC, 30.5 percent of American adults reported sleeping fewer than seven hours a night in 2024.

This may explain why many think cannabis is a good sleep aid. (Spoiler alert: It isn’t.) In a survey of medical cannabis users in the United States and Canada, 46 percent reported using cannabis to manage sleep problems.

THC and CBD are cannabinoids used as sleep aids. THC is psychoactive and produces sedation; CBD is not intoxicating. Some products combine both.

During sleep, the brain strengthens memory, regulates emotions, and supports attention and judgment. Sleep also supports metabolic waste clearance, including amyloid-beta, through processes involving the glymphatic system. Healthy sleep promotes immune, metabolic, and cardiovascular health. Chronic sleep deficits are linked with depression, obesity, diabetes, cognitive decline, and dementia.

Why People Turn to Cannabis for Sleep

Imagine being exhausted but unable to fall asleep. Tomorrow you have an important presentation. The harder you try to sleep, the more it eludes you. You remember some THC gummies. You take one and fall asleep. Problem solved, right?

Maybe. But will you sleep longer? Remain asleep? Spend sufficient time in restorative sleep stages? Wake refreshed, with normal attention and judgment? We don’t know. The evidence is hardly reassuring.

Working with Harvard’s Kevin Hill and colleagues, I examined therapeutic cannabis claims in the American Journal of Psychiatry and JAMA. We concluded that cannabinoid medical claims have advanced much faster than scientific evidence or convincing randomized research clinical trials.

Cannabis or CBD is not FDA-approved for chronic insomnia.

Healthy Sleep Architecture

Normal sleep progresses through approximately four to six cycles nightly, involving three non-rapid eye movement (NREM) stages—light sleep (N1), intermediate sleep (N2), and deep sleep (N3)—followed by rapid eye movement (REM) sleep.

Both NREM and REM sleep support healthy brain and body function. Deep NREM sleep contributes to physical restoration and memory consolidation.

Sleep laboratories use polysomnography to record brain activity, eye movements, muscle activity, and other signals. Sleep efficiency measures the percentage of time spent asleep in bed; fragmentation describes repeated sleep interruptions. Sleep is........

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