Does CBD help difficulty sleeping?
Evidence is limited. A 2019 open-label study of 72 adults found that 66% reported better sleep in the first month. That study had no placebo group, so the result cannot show cause. Reviews of controlled trials report mixed results and sample sizes under 60 people. The FDA has not approved CBD for insomnia or any sleep disorder.
What controlled trials found
Researchers tested CBD in people with anxiety, chronic pain, and epilepsy. Sleep was a secondary measure in most of those trials. Some trials found lower anxiety scores. Sleep results varied. Reviews report doses from 25 mg to 300 mg and follow-up times from 1 night to 3 months. Review authors rate the evidence as low quality.
- 25 mg to 50 mg: used in trials on anxiety and sleep.
- 160 mg to 300 mg: used in trials on sleep and Parkinson disease symptoms.
- No standard dose exists for sleep. Third-party tests have found products with less CBD than the label stated.
What to check on a CBD label
Ask for a batch-level certificate of analysis (COA) from a lab that holds ISO 17025 accreditation. The COA should list CBD mg, THC mg, and a test date. Federal law caps THC at 0.3% on a dry weight basis. State rules differ.
- Total CBD per bottle and per serving in mg.
- THC result for that batch number.
- Lab name, test date, and batch match.
- Other cannabinoids listed (CBN, CBG) at measured amounts.
Risks and drug interactions
CBD changes how the liver breaks down some drugs. The enzymes include CYP3A4 and CYP2C9. Drugs with a narrow safety range need caution. Warfarin, clobazam, and tacrolimus are examples. Trial side effects include diarrhea, fatigue, drowsiness, and higher liver enzymes. The Epidiolex label lists liver injury risk at doses of 10 mg per kg to 20 mg per kg.
Avoid CBD with alcohol or sedatives. Both add to drowsiness.
When to see a clinician
Loud snoring, gasping at night, or daytime sleepiness point to sleep apnea. That needs a sleep study, not a supplement. For chronic insomnia, the American College of Physicians recommends cognitive behavioral therapy for insomnia (CBT-I) as first-line treatment. CBT-I has more evidence than any CBD product.