Most people using CBD for sleep take somewhere between 25 mg and 300 mg, but there is no officially recommended dose. The FDA has not approved CBD for sleep, and no medical organization has issued standard dosing guidelines for it. What exists instead is a patchwork of clinical trials, each using different amounts, along with general patterns from real-world use that can help you find a reasonable starting point.
What Clinical Trials Have Used
The doses tested in sleep research vary widely, which is part of why a single “recommended” number doesn’t exist. One commonly cited study used 300 mg of CBD dissolved in corn oil for difficulty sleeping. Other trials have combined CBD with THC or other cannabinoids at much lower doses, making it hard to isolate CBD’s contribution. The prescription CBD product Epidiolex, approved only for seizure disorders, uses weight-based dosing up to 25 mg/kg/day, but that’s a different medical context entirely.
What most sleep-focused practitioners and product manufacturers suggest is far lower than 300 mg. A common starting range for sleep is 25 to 50 mg taken in the evening, with some people gradually increasing to 100 or 150 mg if they don’t notice an effect. The logic behind starting low is straightforward: CBD appears to have dose-dependent effects that don’t always move in the direction you’d expect.
Why More Isn’t Always Better
CBD does not work like a sedative where a bigger dose means deeper sleep. Animal research has shown that CBD at certain doses actually increased wakefulness and reduced REM sleep, while lower doses promoted slow-wave sleep (the deep, restorative kind). When CBD was combined with THC at higher doses in one study, the combination made subjects more alert rather than sleepier. This suggests there may be a sweet spot, and overshooting it could work against you.
At higher doses, CBD is also more likely to cause side effects. Common ones include drowsiness that carries into the next day, dry mouth, diarrhea, and reduced appetite. An FDA-conducted trial found that at doses of roughly 250 to 550 mg per day taken over four weeks, about 5.6% of participants developed elevated liver enzymes, a sign of liver stress. The agency has noted that liver safety data for daily doses in the 200 to 400 mg range are limited and inconsistent. For sleep purposes, most people don’t need doses anywhere near that range.
Your Body Weight Matters
In clinical settings, CBD is often dosed by body weight, typically calculated as milligrams per kilogram. This means a 130-pound person and a 220-pound person shouldn’t necessarily take the same amount. While no validated formula exists specifically for sleep, the principle holds: if you weigh less, start at the lower end of the range. A common starting point is roughly 0.5 mg per kilogram of body weight, which works out to about 30 mg for someone weighing 130 pounds and about 50 mg for someone at 220 pounds.
How You Take It Changes the Effective Dose
The form of CBD you choose dramatically affects how much actually reaches your bloodstream. When you swallow a gummy or capsule, it passes through your digestive system and liver before entering circulation. This process, called first-pass metabolism, can destroy up to 90% of the CBD before it does anything. Oral products like gummies and capsules have a bioavailability of roughly 6 to 20%.
Sublingual oils and tinctures, held under the tongue for 30 to 60 seconds before swallowing, bypass some of that breakdown. Their bioavailability ranges from about 12 to 35%. In practical terms, a 25 mg gummy might deliver the same amount of active CBD to your system as a 10 mg sublingual dose. So if you switch from a tincture to an edible, you may need a higher milligram number to get the same effect.
Inhaled CBD (vaped or smoked) has the highest bioavailability but carries respiratory risks that make it a poor long-term sleep strategy.
When to Take It Before Bed
Timing depends entirely on the delivery method. Sublingual tinctures typically begin working within 15 to 45 minutes, making them a good option to take about 30 minutes before you want to fall asleep. Edibles and capsules take 60 to 120 minutes to reach peak levels in your blood, so you’d want to take them one to two hours before bedtime. Getting the timing wrong is one of the most common reasons people feel like CBD “didn’t work” for them.
Tolerance Over Time
One advantage CBD appears to have over THC is that it doesn’t seem to build tolerance the same way. Research on THC has shown that chronic use leads to diminishing sleep effects, meaning you need more over time to get the same result. CBD has not shown this pattern in the available evidence, though long-term studies specifically on CBD and sleep are still limited. For now, if a dose works for you, it’s reasonable to expect it will continue working without needing constant increases.
A Practical Starting Approach
Since there’s no official dosage, the most sensible strategy is to start low and increase gradually. Begin with 25 mg of a sublingual oil about 30 minutes before bed, or 25 to 50 mg of a gummy or capsule one to two hours before bed. Stay at that dose for at least a week before deciding it isn’t working. If you notice nothing, increase by 25 mg increments, giving each new dose a full week. Most people who find CBD helpful for sleep settle somewhere between 25 and 150 mg, depending on body weight and delivery method.
Keep in mind that CBD can interact with other medications, particularly blood thinners and drugs processed by the liver. The quality of CBD products also varies significantly since most are not FDA-regulated. Look for products that provide third-party lab testing results, sometimes called certificates of analysis, which verify that the product contains what the label claims and is free of contaminants.