The question "does cbd make you tired" does not have a simple yes or no answer, and that is where most articles on this topic fail readers. They give you one answer when the reality is two completely opposite effects depending on how much you take. Understanding this split lets you use CBD deliberately: lower doses when you want focus, higher doses when you want sleep.
The Dose-Dependent Split: Why CBD Does Two Opposite Things
How CBD Interacts with Your Brain
CBD does not work like THC. It does not bind directly to cannabinoid receptors to produce sedation. Instead, it modulates several neurotransmitter systems at once, and the balance of those effects shifts with dosage:
- At low doses (10-25 mg): CBD primarily affects serotonin receptors (5-HT1A), producing a mild anxiolytic (anti-anxiety) effect without sedation. It also blocks the reuptake of adenosine, which can promote wakefulness, similar to caffeine but much milder.
- At moderate doses (25-75 mg): The calming effect strengthens. GABA modulation begins, which is the same neurotransmitter system that benzodiazepines target. Drowsiness becomes possible, especially in the evening.
- At high doses (75-300 mg): GABA activity dominates. A 2019 study by Shannon et al. found that 25-175 mg nightly reduced anxiety scores in 79% of patients and improved sleep scores in 66% within the first month.
8 min read
Choosing Your Dose by Goal
| Your Goal | Suggested Dose | Expected Effect | Timing |
|---|---|---|---|
| Daytime calm without drowsiness | 10-20 mg | Reduced anxiety, maintained alertness | Morning or afternoon |
| Evening wind-down | 25-50 mg | Relaxation, mild drowsiness possible | 2-3 hours before bed |
| Sleep support | 50-100 mg | Drowsiness, reduced sleep onset time | 60-90 minutes before bed |
| Severe insomnia (anxiety-driven) | 100-200 mg | Strong sedation, significantly faster sleep onset | 60 minutes before bed |
| Pain-related sleep disruption | 75-150 mg | Reduced pain perception, moderate sedation | 60-90 minutes before bed |
Important: These ranges are based on clinical study protocols and general guidelines. Individual responses vary significantly based on body weight, metabolism, tolerance, and the specific CBD product. Always start at the low end and increase gradually over 1-2 weeks.
Six Reasons CBD Might Make You More Tired Than Expected
If you are asking "does cbd make you tired" because you are already experiencing it, one of these factors is likely the cause:
1. Your Dose Is Too High for Daytime
This is the most common reason. A dose that works perfectly for sleep (75 mg) will absolutely make you drowsy at 2 p.m. If you are using CBD during the day, stay under 25 mg until you know your response.
2. Your Product Contains THC
Full-spectrum CBD products sold through licensed Canadian retailers contain trace amounts of THC (up to 0.3%). For most people, this is not enough to feel. But some people are particularly sensitive to THC, and even small amounts cause drowsiness. If you suspect this, switch to a CBD isolate product and see if the tiredness resolves.
3. You Are Taking It with Other Sedating Substances
CBD amplifies the effects of other sedating compounds. If you take CBD with antihistamines (Benadryl, Gravol), prescription sleep aids, alcohol, or even certain herbal teas (chamomile, valerian), the combined sedation can be much stronger than either substance alone.
4. Your Body Is Catching Up on Sleep
This is often misinterpreted as a side effect. If anxiety or pain has been keeping you in light sleep for months, and CBD finally reduces that barrier, your body will compensate with unusually deep sleep for the first 1-2 weeks. You may feel more tired during this catch-up period. This typically resolves on its own.
5. You Are Taking It on an Empty Stomach
CBD absorbs differently depending on whether you have eaten. Taking CBD oil on an empty stomach increases peak blood levels, which can mean a stronger sedating effect than the same dose taken with food. Taking CBD with a meal that contains some fat slows absorption and produces a more gradual, sustained effect.
6. Product Quality or Mislabelling
A 2020 study published in the Journal of the American Medical Association found that 25% of CBD products sold in Canada and the US contained significantly more CBD than labelled. If your "25 mg" capsule actually contains 50 mg, the tiredness is simply a dose issue. Buy from licensed Canadian retailers where products are tested by Health Canada-approved labs.
Brad, Owner, 40+ years of experience: "We are not pharmacists and we do not sell CBD at the store. But I have customers who use it and the pattern is always the same. They tried it once, took too much, felt groggy the next morning, and decided it did not work for them. Then they talk to their doctor, get the dose right, and it becomes one piece of a much larger sleep puzzle. The other pieces are their mattress, their pillow, and their bedroom setup."
CBD Tiredness vs. Other Causes of Fatigue
Before blaming CBD for your tiredness, rule out these common causes that have nothing to do with supplements: Interestingly, many people wonder whether does turkey make you tired, though the science tells a different story than most expect.
| Fatigue Cause | How to Tell | Solution |
|---|---|---|
| Poor sleep quality (not enough deep sleep) | You sleep 7-8 hours but wake exhausted | Address mattress, room temperature, and sleep hygiene first |
| Sleep apnea | Partner hears snoring, you gasp awake, morning headaches | See your doctor for a sleep study |
| Iron deficiency | Fatigue + pale skin, cold hands, brittle nails | Blood work through your doctor |
| Thyroid issues | Fatigue + weight changes, temperature sensitivity | TSH blood test |
| Caffeine timing | Coffee after 2 p.m. disrupts deep sleep | Cut caffeine by noon |
| Old or unsuitable mattress | You toss and turn, wake with aches, mattress is 8+ years old | Test a new mattress at our Brantford showroom |
Using CBD Tiredness Strategically for Better Sleep
If CBD does make you tired, that is not necessarily a problem. It may be exactly what you need, just at the right time of day:
- Move your dose to evening. If you have been taking CBD in the morning or afternoon and feeling drowsy, shift the entire dose to 60-90 minutes before bed. The tiredness becomes a feature, not a bug.
- Split your dose. Take a small dose (10 mg) during the day for anxiety, and a larger dose (50-75 mg) in the evening for sleep. This is how the Shannon et al. 2019 study protocol worked.
- Pair it with sleep environment improvements. CBD reduces the mental barriers to sleep (anxiety, racing thoughts). Your mattress and bedroom handle the physical barriers (comfort, temperature, noise). When both sides are addressed, the combined effect is stronger than either alone.
CBD in Canada: What You Need to Know
Canada's regulatory framework for CBD is stricter than the United States, which is actually good for consumers:
- All CBD products must be purchased through licensed retailers (provincial cannabis stores or licensed online retailers like the OCS in Ontario).
- Products are tested for potency, pesticides, heavy metals, and microbial contamination before reaching consumers.
- Labels are regulated. The CBD content on the label must match what is in the product, within acceptable tolerances.
- CBD is legal across Canada for adults. You do not need a prescription, though a medical cannabis prescription may offer tax benefits.
For more on how CBD compares to other sleep aids like melatonin and magnesium, see our detailed comparison guide.
The Sleep Foundation Approach
Dorothy, our sleep specialist in Brantford, encourages customers to think of sleep as a system rather than a single problem to solve. "CBD might be one useful tool, but it sits alongside your mattress, your pillow, your room temperature, and your evening habits. Fix the biggest bottleneck first. For many of the people who walk through our door, that bottleneck is a mattress that stopped supporting them years ago."
If you are not sure whether your mattress is contributing to poor sleep, come to our Brantford showroom and test a Restonic mattress in your preferred position. White glove delivery is included with every purchase.
This article provides general information about CBD and fatigue. It is not medical advice. CBD can interact with prescription medications, including blood thinners, anti-seizure drugs, and certain antidepressants. Always consult your doctor or pharmacist before using CBD, especially if you take prescription medications.
Sources
- Shannon, S. et al. (2019). "Cannabidiol in Anxiety and Sleep: A Large Case Series." The Permanente Journal, 23, 18-041.
- Nicholson, A. N. et al. (2004). "Effect of delta-9-tetrahydrocannabinol and cannabidiol on nocturnal sleep." Journal of Clinical Psychopharmacology, 24(3), 305-313.
- Suraev, A. S. et al. (2020). "Cannabinoid therapies in the management of sleep disorders." Sleep Medicine Reviews, 53, 101339.
- Freedman, D. A. et al. (2020). "Labeling Accuracy of Cannabidiol Extracts Sold Online." JAMA, 318(17), 1708-1709.
If stress is keeping you up at night, you may also want to read about anxiety dreams and how to stop them.
Shop This Topic at Mattress Miracle
Popular picks at Mattress Miracle:
- Restonic ComfortCare Dalton & Albany pocket-coil mattress
- Whitney double-sided bamboo mattress
- Somnia 3.0 neck support pillow
Or shop the full mattress lineup in our Brantford showroom.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Why does CBD make me tired during the day but not at night?
This is likely a dose timing issue. During the day, your body is naturally fighting sedation (high cortisol, active state), so even mild GABA modulation from CBD feels noticeable. At night, your body is already winding down, so the same dose blends into your natural sleep process. Try reducing your daytime dose to 10-15 mg and keeping the evening dose at its current level.
How long does CBD tiredness last?
CBD's effects typically last 4-6 hours for oils and tinctures, and 6-8 hours for capsules and edibles. If you take CBD oil at 9 p.m., any drowsiness should be gone by morning. If you still feel groggy, your dose is too high, you took it too late, or your product contains more THC than expected.
Can I drive after taking CBD?
At low doses (under 25 mg), CBD is unlikely to impair driving ability. However, at higher doses or with full-spectrum products containing THC, drowsiness is possible. Canada's impaired driving laws apply to cannabis products including CBD. If you feel at all drowsy, do not drive. Wait until you know how a specific dose affects you before driving after taking it.
Does CBD make you more tired than melatonin?
They produce different types of tiredness. Melatonin produces a "time to sleep" signal that makes you feel ready for bed. High-dose CBD produces muscle relaxation and mental quieting that reduces the effort of falling asleep. Neither is as sedating as prescription sleep aids. For a detailed comparison, see our guide to CBD and sleepiness.
Will the tiredness from CBD go away with regular use?
Partial tolerance to CBD's sedating effects does develop over 2-4 weeks of regular use. If you feel very tired the first few days, that effect typically softens as your endocannabinoid system adjusts. If tiredness persists beyond 2 weeks, reduce your dose rather than waiting for tolerance to build further.
Address the Physical Side of Sleep
CBD handles the mental side. Your mattress handles the physical side. At Mattress Miracle, we have helped Brantford families sleep better since 1997. Visit our showroom at 441 1/2 West Street to test a Restonic mattress, or call (519) 770-0001 for current promotions.
Mattress Miracle
441 1/2 West Street, Brantford, ON N3R 3V9
Mon-Wed 10-6 | Thu-Fri 10-7 | Sat 10-5 | Sun 12-4
Related Reading
For more on how diet affects your energy, read our guide on tired after eating sugar.
Related reading: Why Does the Sun Make You Tired? Heat, UV, and Sleep Science
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.