Cannabis gummies can shorten the time it takes to fall asleep. They also cause side effects. The most common are next-day grogginess, dry mouth, dizziness, and slow reaction time. Edibles take 30 to 120 minutes to work. Taking a second gummy before the first one peaks is a main cause of emergency department visits for edible cannabis.
What the evidence shows
No cannabis product has FDA approval to treat insomnia. A 2017 National Academies review found limited evidence that cannabinoids improve sleep in people with chronic pain, obstructive sleep apnea, fibromyalgia, and multiple sclerosis. Trials of CBD for sleep used 25 mg to 600 mg per day. THC shortens REM sleep. Tolerance to the sedative effect can appear after several nights of use.
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Common side effects
- Drowsiness that lasts into the morning
- Dry mouth
- Dizziness and balance problems
- Slower reaction time, which affects driving
- Short-term memory and attention problems
- Higher heart rate, up 20 to 50 beats per minute in the first hours
- Anxiety, paranoia, and racing thoughts at high doses
- Nausea, vomiting, and headache
Dosing and timing
Edible THC passes through the liver and converts to 11-hydroxy-THC, a compound with stronger psychoactive effects than inhaled THC. Onset runs 30 to 120 minutes. Peak blood levels arrive at 2 to 4 hours. Effects last 6 to 8 hours, and some users feel them for 12 hours. A gummy taken at 10 p.m. can still impair driving at 7 a.m. Wait at least 2 hours before taking more. Start at 2.5 mg THC or less if you have not used edibles.
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Sleep architecture and rebound
THC reduces REM sleep and can increase slow-wave sleep in the first nights of use. The effect fades with nightly use. Stopping after weeks of daily use can trigger rebound insomnia, vivid dreams, night sweats, and irritability. These symptoms last several days to 2 weeks.
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Drug interactions
CBD blocks the CYP3A4 and CYP2C19 enzymes. That raises blood levels of some drugs, including clobazam, warfarin, and certain statins. THC adds to the sedation from alcohol, benzodiazepines, opioids, and sleep aids. Check with a pharmacist before combining a gummy with prescription drugs.
Product labels
A 2015 JAMA study of edible medical cannabis found that 17% of products matched their THC label within 10%. Tests of CBD products show similar gaps. A gummy labeled 5 mg THC may contain none or 15 mg. CBN is sold as a sleep aid, but human trial data on CBN and sleep are scarce.
Heart and stomach risks
The American Heart Association states that cannabis use is linked to a higher risk of heart attack, arrhythmia, and stroke. Risk is highest in the hours after use. Long-term daily use can cause cannabis hyperemesis syndrome: repeated vomiting, stomach pain, and relief from hot showers.
Lower-risk practices
- Start with 2.5 mg THC or less.
- Buy from a licensed dispensary that posts batch test results.
- Take the gummy 2 hours before bed.
- Do not mix with alcohol, opioids, or benzodiazepines.
- Use 3 or 4 nights per week instead of every night.
- Store gummies away from children and pets. Child-resistant packaging is not child-proof.
When to stop
Stop use and contact a clinician for chest pain, fainting, a heart rate above 120 at rest, severe vomiting, or confusion. Talk to a doctor if sleep problems continue for more than 3 weeks after you stop.