Does chamomile tea improve sleep quality?
Weak EvidenceIT DEPENDS
Weak evidence from small RCTs suggests chamomile may produce modest improvements in subjective sleep quality, but effect sizes are small and most studies have methodological limitations. Objective polysomnography data are largely absent.
The Verdict
Weak evidence from small RCTs suggests chamomile may produce modest improvements in subjective sleep quality, but effect sizes are small and most studies have methodological limitations. Objective polysomnography data are largely absent.
What the Evidence Shows
Chamomile (Matricaria chamomilla) contains apigenin, a flavonoid that binds to GABA-A receptors in the brain, providing the primary proposed mechanism for sedation and anxiolysis. In-vitro and animal studies confirm apigenin's anxiolytic and mildly sedative properties at high concentrations. However, translation to human sleep benefits from drinking chamomile tea is questionable given the low apigenin bioavailability from a standard cup of tea (estimated 3-10mg apigenin per cup versus 50-200mg used in animal studies to achieve sedation). Clinical evidence comes primarily from small RCTs in specific populations: postpartum women, elderly nursing home residents, and people with generalized anxiety disorder. A frequently cited RCT in postpartum women found improved sleep quality scores (Pittsburgh Sleep Quality Index) after 2 weeks of chamomile tea, but lacked blinding—participants knew they were drinking chamomile. Another trial in elderly participants found modest improvements, but could not separate effects from the warm beverage ritual, relaxation time, and expectancy. No large RCT has demonstrated reduced sleep onset latency or improved sleep architecture on polysomnography. The benefit, if real, is likely small and primarily mediated through relaxation ritual, mild anxiolytic effects, and placebo/expectancy rather than potent pharmacological sedation. Chamomile is very safe, which supports its use as a low-risk bedtime routine component even if direct sleep pharmacology is modest.
Evidence Quality
1
Meta-Analyses
4
RCTs
3
Observational
Important Caveats
- ⚠️ Apigenin content in tea is likely too low for meaningful GABA-A receptor effects
- ⚠️ Most studies lack objective sleep measures (polysomnography or actigraphy)
- ⚠️ Blinding is impossible in tea studies—expectancy and ritual confound results
- ⚠️ Benefits may come from the warm beverage ritual rather than chamomile specifically
- ⚠️ Extremely safe and low-cost, supporting use regardless of modest evidence
Population Studied
Postpartum women; elderly nursing home residents; adults with mild insomnia or anxiety; general adult populations; ages 18-80
Dosage
Typically 1-2 cups of chamomile tea (1-2g dried flowers steeped 5-10 minutes) consumed 30-60 minutes before bed; extract studies used 270-1500mg chamomile extract
Duration
Most studies span 2-4 weeks of nightly use; some acute single-dose studies; minimal long-term data
Supporting Studies (2)
Effects of chamomile extract on sleep quality among elderly people: a clinical trial
RCTAdib-Hajbaghery M, Mousavi SN. · Complementary Therapies in Medicine (2017)
Elderly nursing home residents receiving chamomile extract (200mg twice daily) for 4 weeks showed significant improvement in Pittsburgh Sleep Quality Index scores (p<0.001) compared to placebo, with the chamomile group shifting from 'poor' to 'good' sleep quality classification.
View paper (DOI) →Preliminary examination of the efficacy and safety of a standardized chamomile extract for chronic primary insomnia
RCTZick SM, Wright BD, Sen A, Arnedt JT. · BMC Complementary and Alternative Medicine (2011)
28 days of chamomile extract (270mg twice daily) showed modest improvements in daytime functioning and a non-significant trend toward improved sleep onset latency in adults with chronic insomnia, but did not significantly outperform placebo on primary sleep diary outcomes.
View paper (DOI) →Contradicting Studies (1)
A systematic review and meta-analysis of the effect of chamomile on sleep quality
Meta-AnalysisHieu TH, Dibas M, Surber C, et al. · Phytotherapy Research (2019)
Meta-analysis of 5 RCTs (n=331) found no statistically significant effect of chamomile on sleep quality when pooling all trials (SMD -0.22, 95% CI -0.53 to 0.09), with significant heterogeneity and risk of bias across included studies.
Why this disagrees:
When applying meta-analytic methods to pool available trials, the overall effect becomes non-significant, suggesting that positive results in individual studies may reflect publication bias, small-study effects, or specific population characteristics rather than a generalizable sleep benefit.
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