Meditation and Mindfulness for Stress, Sleep and Anxiety: What the Evidence Shows
What reviews show for meditation and mindfulness on stress, sleep and anxiety, by population and comparison group, with honest limits on study quality and follow-up.
Content last updated . This page has not been medically reviewed.
How to read this evidence
Meditation cannot be blinded, so people know what they are getting and expectations can shape results. The strongest studies compare it with an active comparison, such as health education or another therapy, not just a waitlist. The table shows what the main reviews found. Labels: promising but limited, mixed, insufficient evidence.
| Question | What the source found | Strength |
|---|---|---|
| Stress, healthy adults | MBSR moderately effective; 29 studies, high variation [1] | promising but limited |
| Stress/distress, clinical groups | Low evidence of improvement against active controls [2] | insufficient to mixed |
| Sleep quality | Better than non-specific active controls; no different from evidence-based sleep treatments [3] | promising but limited |
| Anxiety | Moderate evidence of small to moderate improvement [2] | promising but limited |
| Diagnosed anxiety disorders | Mixed short-term results, no long-term effect seen [4] | mixed |
Stress
A 2015 meta-analysis of 29 studies (2,668 healthy adults) found MBSR moderately effective for stress, with large effects on stress and moderate effects on anxiety, depression and quality of life, kept at about 19 weeks. Heterogeneity was high. [1] A 2014 review of trials with active controls found low evidence of improved stress and distress and no evidence meditation programs beat other active treatments such as drugs, exercise or other behavioral therapies. [2] A 2013 meta-analysis found mindfulness-based therapy did not differ from traditional CBT. [5]On body markers, a 2017 meta-analysis of 45 randomized trials found meditation reduced cortisol, blood pressure and heart rate versus active controls. [6] These are physiological findings, not guaranteed improvements in how you feel. For everyday options see mindfulness and meditation for stress and how to relieve stress.
Sleep
A 2019 meta-analysis of 18 trials (1,654 participants) found mindfulness meditation improved sleep quality compared with non-specific active controls (effect size 0.33 after the program), but showed no effect compared with evidence-based sleep treatments. The authors called findings preliminary. [3] NCCIH reports the same trial group and says effects were no different than CBT and exercise. [4] The 2014 review found low or insufficient evidence for sleep. [2] Label: promising but limited. For sleep habits and relaxation see relaxation for sleep and sleep safety and when to get help.Anxiety-related Outcomes
The 2014 review found moderate evidence of small to moderate anxiety improvement (effect size 0.38 at 8 weeks, 0.22 at 3 to 6 months). [2] A 2018 analysis of 142 groups with diagnosed psychiatric disorders found mindfulness approaches better than no treatment and about as good as established treatments for anxiety and depression. [4]For diagnosed anxiety disorders, a 2021 analysis of 23 studies (1,815 participants) found mixed short-term results, unclear risk of bias in all studies, and no long-term effects in the few studies that followed up beyond 2 months. [4] Online programs show small anxiety effects (g = 0.26). [7] Label: mixed. See anxiety disorders and therapy for anxiety and stress.
Safety and when to get help
Meditation is usually considered low risk, but about 8% of participants in a 2020 review reported adverse effects, the most common being anxiety and depression. [4][8] If anxiety worsens, stop and talk with a clinician. Do not use meditation to postpone care. [4] For urgent emotional crisis in the US, the 988 Suicide & Crisis Lifeline offers free support by call, text or chat, day or night. [9]Frequently asked questions
Does meditation reduce stress?
Reviews find small to moderate benefits, with limits on study quality; it did not beat other active treatments. [2][1]
Does meditation help with sleep?
It improved sleep quality versus non-specific controls but not versus established sleep treatments. [3]
Is it as good as therapy for anxiety?
One analysis found mindfulness approaches worked about as well as established treatments for anxiety and depression; results for diagnosed anxiety disorders were mixed. [4]
Can meditation make anxiety worse?
Yes, for some people; anxiety was the most commonly reported adverse effect. [8]
References
- Khoury B, et al. Mindfulness-based stress reduction for healthy individuals: A meta-analysis. J Psychosom Res. 2015. Read 2026-10-22.
- Goyal M, et al. Meditation programs for psychological stress and well-being: a systematic review and meta-analysis. JAMA Intern Med. 2014. Read 2026-10-22.
- Rusch HL, et al. The effect of mindfulness meditation on sleep quality: a systematic review and meta-analysis of randomized controlled trials. Ann N Y Acad Sci. 2019. Read 2026-10-22.
- National Center for Complementary and Integrative Health. Meditation and Mindfulness: Effectiveness and Safety. Read 2026-10-22.
- Khoury B, et al. Mindfulness-based therapy: a comprehensive meta-analysis. Clin Psychol Rev. 2013. Read 2026-10-22.
- Pascoe MC, et al. Mindfulness mediates the physiological markers of stress: Systematic review and meta-analysis. J Psychiatr Res. 2017. Read 2026-10-22.
- Sommers-Spijkerman M, et al. New Evidence in the Booming Field of Online Mindfulness: An Updated Meta-analysis of Randomized Controlled Trials. JMIR Ment Health. 2021. Read 2026-10-22.
- Farias M, et al. Adverse events in meditation practices and meditation-based therapies: a systematic review. Acta Psychiatr Scand. 2020. Read 2026-10-22.
- 988 Suicide & Crisis Lifeline. 988lifeline.org. Read 2026-10-22.