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Can't sleep after quitting weed? How long it lasts

Checked against the sources at the bottom on 2026-10-16. This is general information, not medical advice.

Bad sleep is one of the most common complaints when people stop using weed: lying awake for hours, waking again and again, or dreams so vivid they feel real. For the full list of withdrawal symptoms, see our weed withdrawal timeline. Most of the numbers below come from small studies of heavy users, so read them as a rough guide.

The short answer

In studies of heavy users, sleep trouble usually starts in the first 1 to 3 days and is worst in the first week. In a study that followed 18 heavy users through 45 days without weed, most withdrawal effects, including sleep problems, lasted 4 to 14 days (Budney and colleagues, 2003). Sleep is often slower to settle than other symptoms. A 2022 review says sleep problems may continue for several weeks or longer (Connor and colleagues, 2022), and a 2016 review pointed to studies where sleep difficulty lasted about 43 days and strange dreams up to 45 days (Angarita and colleagues, 2016).

Why quitting weed disrupts sleep

Weed can make it easier to fall asleep, especially over short periods. With regular use, the body adapts. A 2016 review says chronic users build tolerance to most of the effects seen in new users, including its help falling asleep and its boost to deep sleep. When heavy users stop, sleep lab studies have found that it takes longer to fall asleep, people spend more time awake during the night, and total sleep and deep sleep go down (Angarita and colleagues, 2016). A systematic review of 36 publications agreed that sleep is often interrupted during withdrawal, though weak study designs make the details uncertain (Gates and colleagues, 2016).

This is also why using again can seem to fix it. Angarita's review notes that withdrawal sleep problems improve with THC or a return to cannabis, but that the sleep benefits of THC fade with regular use and long-term use leads to more severe sleep problems.

Insomnia: what sleep studies measured

Vivid dreams and nightmares

Dreams can happen in any stage of sleep, but they are usually most vivid during REM sleep (NINDS). Several sleep lab studies have recorded more REM sleep after people stop using cannabis, often called REM rebound, though results on REM sleep differ between studies (Angarita and colleagues, 2016).

According to Angarita's review, strange dreams typically begin 1 to 3 days after stopping, peak after 2 to 6 days and last 4 to 14 days, though one study found them lasting up to 45 days. In the study of 49 dependent users, nightmares or strange dreams were the scale's strongest sign of withdrawal, but caused relatively little distress (Allsop and colleagues, 2011).

Why sleep matters for staying quit

Night-by-night summary

Time since last use What studies found
Nights 1 to 3 Withdrawal usually starts 24 to 48 hours after stopping, often with insomnia (Connor 2022). Strange dreams typically begin (Angarita 2016).
Days 2 to 6 Most withdrawal symptoms peak (Connor 2022). Strange dreams peak (Angarita 2016).
Days 7 to 14 Most withdrawal effects lasted 4 to 14 days in a 45-day study (Budney 2003).
Weeks 3 to 6 Sleep problems may continue for several weeks or longer (Connor 2022). Studies recorded sleep difficulty for about 43 days and strange dreams for up to 45 days (Angarita 2016).
3 months or more The NHS calls insomnia that lasts 3 months or longer long-term insomnia.

What helps: sleep habits from health agencies

No medicine is approved specifically for cannabis withdrawal. Sleep hygiene and cognitive behavioral therapy for insomnia (CBT-I) may help sleep during cannabis withdrawal, but this has not been well studied (Connor and colleagues, 2022). These are the general habits the NHS and CDC recommend:

Be careful with swaps. Using alcohol or other sedatives to get to sleep is common after quitting (Angarita and colleagues, 2016), but the NHS lists alcohol, caffeine and nicotine among the most common causes of insomnia. It also says pharmacy sleep aids may help for 1 to 2 weeks at most, and to check with your doctor before taking anything for sleep.

Tracking your focus while your sleep recovers

Fogless is a free quit tracker that runs in your browser. Next to the day counter, it has a one-minute brain check: a reaction time test (five taps, and it keeps the median), a number memory test that adds a digit each time you get one right, and a focus test where you tap the direction of the middle arrow. Your first check is your baseline of 100, and later checks are compared to it.

Sleep moves these scores. A meta-analysis of 70 studies found that short-term total sleep loss had its largest effect on lapses in simple attention (Lim and Dinges, 2010), so a short night may lower your score. Scores also go up with practice (Bartels and colleagues, 2010), so the trend over several weeks says more than any single day. Fogless does not diagnose anything and does not treat insomnia or withdrawal. There is no account, and your data stays on your device. The free version shows your last five checks; Pro ($4.99 a month or $29 a year) adds a trend line for each test, your average for each week since you quit, and the full history.

When to get help

FAQ

How long does insomnia last after quitting weed?

For most heavy users in studies, sleep is worst in the first 1 to 2 weeks. It may stay disturbed for several weeks or longer, and one study recorded sleep difficulty for about 43 days.

Why do I have vivid dreams after quitting weed?

Dreams are usually most vivid during REM sleep, and several studies recorded more REM sleep after people stopped using cannabis. Strange dreams typically start 1 to 3 days after quitting and fade within about 2 weeks, though one study found them lasting up to 45 days.

Will smoking again help me sleep?

Withdrawal sleep problems ease with THC, but a 2016 review says its sleep benefits fade with regular use, and long-term use leads to more severe sleep problems.

Is there medicine for sleep problems after quitting weed?

No medicine is approved specifically for cannabis withdrawal. The NHS says to check with your doctor before taking anything for sleep.

If you want to see how your focus changes as your sleep recovers, take your first brain check in Fogless. It takes about a minute and needs no account. For memory, see does your memory come back after you quit weed?

Sources

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Need to talk to someone? SAMHSA's National Helpline is free, confidential and open 24/7 at 1-800-662-4357. In a crisis, call or text 988.