If you are comparing ashwagandha vs reishi for sleep, the short answer is this: ashwagandha has better human evidence for stress-related sleep improvement, while reishi has a calmer reputation but weaker direct clinical support. Both are popular in nighttime supplement formulas, but they are not interchangeable.
Quick Answer: Ashwagandha has stronger and more consistent evidence for sleep improvement than reishi. Multiple randomized trials show ashwagandha reduces time to fall asleep, improves sleep quality scores, and lowers nighttime cortisol. Reishi shows some benefit for sleep quality in Japanese research but with a thinner evidence base.
Key Takeaways
- Ashwagandha’s sleep benefits work primarily through cortisol reduction and anxiolytic (calming) effects.
- Two well-designed trials (Langade 2019 and 2021) show ashwagandha significantly improves sleep onset latency and overall quality.
- Reishi contains triterpenes that may promote relaxation; sleep research exists but is less robust than ashwagandha’s.
- Ashwagandha is the more evidence-backed choice for sleep-specific concerns.
- Both can be combined since they work through different mechanisms, but testing one at a time helps identify your individual response.
How they differ
Ashwagandha: stronger evidence for stress and sleep quality
Ashwagandha is an adaptogenic herb studied for stress, anxiety, and sleep quality. Several randomized controlled trials suggest it may help adults fall asleep more easily, improve sleep quality scores, and reduce perceived stress. For people whose sleep problems are linked to an overactive stress response, this makes ashwagandha the more evidence-based choice.
Reishi: more traditional use, less direct sleep research
Reishi is a medicinal mushroom used in traditional East Asian wellness practices. Many people describe it as grounding or relaxing, especially in nighttime teas or blends. But compared with ashwagandha, there are fewer human sleep studies. Some of the enthusiasm around reishi comes from traditional use, animal data, and general wellness positioning rather than robust insomnia trials.
Best use cases
Choose ashwagandha when stress is the bottleneck
Ashwagandha tends to make more sense when you have:
- Difficulty winding down after a stressful day
- Stress-related sleep latency
- Anxiety symptoms tied to poor sleep
- A “tired but wired” pattern
Choose reishi when you want a gentler nighttime ritual
Reishi may appeal if you want:
- A non-stimulant evening mushroom powder or tea
- A calmer subjective feel without expecting a sedative effect
- A supplement that fits a broader mushroom routine
Which works faster?
Neither should be treated like an instant sleep aid. Most ashwagandha studies look at benefits over weeks, not overnight. Reishi is often used as part of a nightly routine, but evidence does not clearly show a fast, direct sleep-onset effect. If you need immediate sedation, these are usually not the right tools.
What about side effects?
Ashwagandha side effects
Possible side effects include stomach upset, drowsiness, and rarely liver-related concerns. People with thyroid issues, autoimmune disease, pregnancy, or medication use should speak with a clinician before using it.
Reishi side effects
Reishi can cause digestive upset, dry mouth, or dizziness in some users and may interact with blood thinners or immune-active medications.
Which one is better overall?
For most people specifically searching for the best adaptogen for sleep, ashwagandha is usually the better first choice because the evidence is stronger. Reishi is better viewed as a traditional calming option with more limited direct support.
That does not make reishi useless. It just means it is easier to recommend ashwagandha first if sleep complaints are tied to stress or anxiety.
Can you combine them?
Some nighttime formulas combine ashwagandha and reishi, hoping to cover both stress support and a calming ritual effect. That can be reasonable, but combination products make it harder to know what is helping. If you are testing tolerance or effectiveness, start with one product at a time.
FAQ
Is ashwagandha or reishi better for falling asleep?
Ashwagandha is generally the better-supported option when stress and hyperarousal are delaying sleep.
Is reishi sedating?
Not in the same way as a sleep medication. Some users find it calming, but the evidence for a strong sedative effect is limited.
Can I take ashwagandha every night?
Many studies use daily intake over several weeks, but long-term use should still be discussed with a clinician if you have health conditions or take medications.
Sources
- Langade D, et al. Efficacy and safety of ashwagandha root extract in insomnia and anxiety: a double-blind, randomized, placebo-controlled study. Cureus. 2019.
- Salve J, et al. Adaptogenic and anxiolytic effects of ashwagandha root extract in adults with stress and insomnia. Cureus. 2019.
- Lopresti AL, et al. Randomized, double-blind, placebo-controlled study of ashwagandha extract for stress relief. Medicine (Baltimore). 2019.
- National Center for Complementary and Integrative Health. Ashwagandha: What You Need To Know.
- National Center for Complementary and Integrative Health. Reishi Mushroom: What You Need To Know.
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Sources
- Non-rapid eye movement sleep determines resilience to social stress. eLife. 2022. PMID: 36149059.
- Sleep recalibrates homeostatic and associative synaptic plasticity in the human cortex. Nature communications. 2016. PMID: 27551934.
- Centella Asiatica in Dermatology (2014)
- Bakuchiol: Plant-Based Retinol
- Propolis Skincare for Acne
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