Does Reishi Make You Sleepy? What to Expect at Night

It's a fair question, and one of the most common we hear about evening supplements: does reishi make you sleepy? Reishi isn't a sedative, so it won't knock you out the way a sleep aid does. The first hour passes without much happening, and sudden drowsiness isn't what people report. That's why it usually shows up as part of a wind-down routine rather than a switch you flip at bedtime.

📖 Table of Contents

1. Key Takeaways
2. What Reishi Mushrooms Are
3. Why Reishi Isn't a Sedative
4. Does Reishi Help You Sleep?What the Research Measured
5. What People Report
6. When to Take Reishi at Night and How Much
7. How to Work Reishi Supplements Into Your Nightly Routine
8. Will Reishi Make You Groggy the Next Day?
9. Side Effects and Things to Know Before You Start
10. What to Look for Before You Buy
11. Frequently Asked Questions
12. Does Reishi Make You Feel Sleepy Right Away?
13. Is It Better To Take Reishi in the Morning or at Night?
14. Can Reishi Keep You Up at Night?
15. How Long Does It Take To Notice Anything?
16. What Shouldn’t You Mix With Reishi?
17. Is Reishi Safe To Take Every Day?
18. The Bottom Line

Key Takeaways

• Reishi isn't a sedative, and sudden drowsiness isn't part of the picture.
  
  
• Evening dosing is the norm, usually folded into a wind-down routine.
  
  
• Nothing about it is fast-acting, so most people judge it over a few weeks.
  
  
• Nearly all of the sleep research so far has been done in mice, not people.
  
  
• On the label, the details worth checking are fruiting body, beta-glucan content, and third-party testing.

What Reishi Mushrooms Are

Reishi, or Ganoderma lucidum, is a woody fungus that grows on hardwood trees. East Asian herbal traditions have used it for centuries, where it goes by lingzhi. The mushroom is naturally bitter and tough, which is why you'll almost always find it sold as an extract: gummies, capsules, or powder.

Researchers focus on two groups of compounds, beta-glucans and triterpenes, and both are concentrated in the fruiting body. That detail matters more than most packaging lets on.

Why Reishi Isn't a Sedative

If you're picturing something that kicks in within 20 minutes, reset that expectation. Reishi is sold as an adaptogenic mushroom rather than a sleep drug, and it isn't formulated to behave like one.

Worth saying plainly, because expectation drives most of the disappointment we hear about. Take reishi mushrooms expecting a nightcap effect, and you'll be underwhelmed. Treat them as one small piece of a wind-down routine, and the fit makes far more sense.

Does Reishi Help You Sleep?">What the Research Measured

Here's the part most articles skip. Nearly all of the sleep work on reishi has been done in mice, and it measures two things: sleep latency, or how long the animals took to fall asleep, and sleep duration, or how long they stayed asleep.

A 2021 study in Scientific Reports found that an extract of Ganoderma lucidum shortened sleep latency and extended sleep duration in mice. The interesting part came next: when researchers wiped out the animals' gut bacteria, the effect disappeared, which points to the gut microbiome as a necessary link in the pathway.

A 2024 Heliyon study fed mice two reishi preparations for 14 days and got different results from each. Formulation matters, in other words, and two products labeled "reishi" aren't interchangeable.

Human evidence is much thinner. The most widely cited human trial, a 2005 randomized, placebo-controlled study in the Journal of Medicinal Food, was run in a clinical population rather than in healthy adults who simply sleep badly.3 A 2025 GRADE-assessed systematic review in Food Science & Nutrition pooled the human clinical trials on Ganoderma lucidum and graded the certainty of that evidence.

So when a confident headline about reishi and sleep crosses your feed, check whether it describes mice or people. Usually it's mice.

What People Report

Scroll any supplement forum and the pattern holds. Almost nobody describes a knockout effect. A fair number notice nothing in week one. The people who stick with reishi mushrooms tend to describe their evenings as less rushed rather than claim they fall asleep faster. Plenty of others say it does nothing at all. For something with thin human data, that's a normal spread, and we'd rather say so than pretend otherwise.

When to Take Reishi at Night and How Much

Evening is the usual choice. Many people take reishi mushrooms about one to two hours before bed, once the day has already started to wind down.

On amounts: most commercial extracts are dosed at 1 to 2 grams per day, though that shifts depending on whether the product is an extract or a raw powder. Follow the label on the product you bought. Our full breakdown lives in our guide to how much reishi per day.

A few practical notes:

• Take it with a little food. Extracts usually sit easier on the stomach that way.
  
  
• Keep the timing consistent. Landing in roughly the same window each night matters more than hitting an exact time.
  
  
• Give it a few weeks. This isn't a one-night experiment.

Morning works too, and nothing about reishi mushrooms makes daytime use a problem.

How to Work Reishi Supplements Into Your Nightly Routine

Attach your evening dose to something you already do, like brushing your teeth.

Our Unwind gummies were built for exactly this slot. Keep them somewhere cool and dry, and read up on storing your mushroom gummies.

Will Reishi Make You Groggy the Next Day?

Reishi mushrooms aren't sedatives, so there's nothing to sleep off. Next-day grogginess isn't something we hear about from customers, and it doesn't appear on Memorial Sloan Kettering's list of reported reactions either.

If you do wake up foggy, look at the other variables first. A late coffee, a heavy dinner, screens in bed, or a warm room will move the needle far more than a supplement does.

Side Effects and Things to Know Before You Start

The NIH LiverTox database notes that in short-term clinical trials, reishi is usually described as having few or no adverse effects, with side effects that are mild and comparable to a placebo. Still, "well tolerated" isn't the same as "no effects at all."

• Reported side effects: Memorial Sloan Kettering's herb database lists nausea, dry mouth, constipation, itching, and dizziness among reported reactions. Worth flagging here: insomnia is on that list, too. It's uncommon, but a small number of people report the opposite of what they expected.
  
  
• Liver considerations: LiverTox gives reishi a likelihood score of D, meaning a possible rare cause of clinically apparent liver injury. It adds that, given how widely reishi is used worldwide, such cases must be extremely rare, and that many reports didn't rule out other causes.
  
  
• Interactions to bring up with your provider: Talk with your healthcare provider before adding reishi mushrooms if you take blood thinners, antiplatelet drugs, immunosuppressants, or blood pressure medication. The same applies if you're pregnant or nursing, or if you have surgery scheduled.

None of this is cause for alarm. It's a reason to read the label and check with someone qualified if you take prescription medication.

What to Look for Before You Buy

Reishi mushrooms on the shelf are not all the same, and the back of the package tells you far more than the front does.

• Fruiting body, not grain: "Mycelium on rice" products carry a lot of starch.
  
  
• Extraction method: Dual extraction pulls both the water-soluble and the alcohol-soluble compounds.
  
  
• A stated beta-glucan number: A brand willing to print it is a brand that measured it.
  
  
• Third-party tested, made in a GMP (good manufacturing practice) facility: That one isn't optional for us.

Still comparing? Our pieces on reishi vs. turkey tail, cordyceps vs. reishi, and identifying reishi look-alikes are worth reading.

Frequently Asked Questions

Does Reishi Make You Feel Sleepy Right Away?

No. It isn't a sedative and doesn't produce drowsiness on a timer. Nothing about reishi is fast-acting, so most people give it a few weeks of steady use before forming an opinion.

Is It Better To Take Reishi in the Morning or at Night?

Either works. Evening is the popular choice because it fits a wind-down routine, but reishi mushrooms don't have to be taken at night. Pick the time you'll actually stick with.

Can Reishi Keep You Up at Night?

It isn't a stimulant, so this isn't a common complaint. Insomnia does appear on Memorial Sloan Kettering's list of reported reactions, so a small number of people do experience it.5 If your sleep changes after starting anything new, pause and check with your provider.

How Long Does It Take To Notice Anything?

Two to four weeks of consistent use is what most people give it before deciding either way. It isn't a same-night product.

What Shouldn’t You Mix With Reishi?

Check with your provider first, particularly if you take blood thinners, antiplatelet drugs, immunosuppressants, or blood pressure medication.5

Is Reishi Safe To Take Every Day?

Short-term trials generally describe it as well-tolerated.6 Long-term data in healthy adults is limited, so follow the label and loop in your provider if you plan to take it indefinitely.

The Bottom Line

Reishi isn't a switch that turns your brain off. It's a quiet addition to a wind-down routine, and the human evidence is thinner than the internet suggests. The rest of your evening still has to do its share. Set your expectations there, and you'll be happier with the result.

Sources

1. Yao, C., et al. "Ganoderma lucidum promotes sleep through a gut microbiota-dependent and serotonin-involved pathway in mice." Scientific Reports, 2021. https://www.nature.com/articles/s41598-021-92913-6
   
   
2. Li, K., et al. "The anti-fatigue and sleep-aiding effects vary significantly among different recipes containing Ganoderma lucidum extracts." Heliyon, 2024. https://pmc.ncbi.nlm.nih.gov/articles/PMC11103526/
   
   
3. Tang, W., et al. "A randomized, double-blind and placebo-controlled study of a Ganoderma lucidum polysaccharide extract in neurasthenia." Journal of Medicinal Food, 2005. https://pubmed.ncbi.nlm.nih.gov/15857210/
   
   
4. Jafari, S., et al. "The Nutritional Significance of Ganoderma lucidum on Human Health: A GRADE-Assessed Systematic Review and Meta-Analysis of Clinical Trials." Food Science & Nutrition, 2025. https://pubmed.ncbi.nlm.nih.gov/40510787/
   
   
5. Memorial Sloan Kettering Cancer Center. "Reishi Mushroom." About the Herbs database. https://www.mskcc.org/cancer-care/integrative-medicine/herbs/reishi-mushroom
   
   
6. National Institutes of Health. "Lingzhi, Reishi." LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. https://www.ncbi.nlm.nih.gov/books/NBK609014/

This article is for general information only and isn't medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.