Prayer and Faith Improve Sleep Quality But Only When Stress Is Already Low
NIH researchers find religiosity and spirituality reduce nonrestorative sleep in Black women — but only among those with low stress levels.
Summary
A large NIH study of nearly 1,700 young Black women found that religious and spiritual practices — including daily prayer, meditation, and drawing comfort from faith — were associated with better sleep quality, specifically fewer nights of waking unrefreshed. However, this benefit was only present in women reporting low or no stress. Among those with high stress, religiosity showed no protective effect on sleep. The study tracked multiple sleep outcomes including short sleep duration, insomnia symptoms, and nonrestorative sleep over several years. Findings suggest that spirituality may support sleep through stress-buffering pathways, but when stress is overwhelmingly high, spiritual resources alone may not be sufficient to overcome its negative effects on sleep quality.
Detailed Summary
Sleep disparities among Black and African American women are well-documented, yet the social and psychological factors that might buffer against poor sleep in this population remain understudied. Religiosity and spirituality are central to the lives of many Black women and have been hypothesized to protect health — but their relationship to sleep health, particularly as modified by stress, has not been rigorously examined.
This study analyzed data from 1,693 Black women enrolled in the Study of Environment, Lifestyle, & Fibroids (SELF), a longitudinal cohort followed from 2010 to 2018. Participants completed baseline measures of faith importance, spirituality as a source of comfort, and prayer or meditation frequency. Sleep outcomes — including short sleep duration under seven hours, nonrestorative sleep, and insomnia symptoms — were measured repeatedly over time. Stress levels were also tracked across follow-up visits.
At baseline, poor sleep was highly prevalent: 58% reported short sleep, 62% reported nonrestorative sleep, and 18% reported insomnia symptoms. Over 55% perceived spirituality as a source of comfort, and nearly 59% prayed or meditated daily. Critically, all three spirituality measures were cross-sectionally associated with lower rates of nonrestorative sleep — but only among women who reported low or no stress. Among high-stress participants, no protective association was found. Longitudinal associations did not persist, suggesting effects may be context-dependent or transient.
These findings carry important implications. Spirituality appears to function as a stress-buffering resource that supports sleep quality when baseline stress is manageable. But when stress is severe, spiritual coping alone is insufficient to protect sleep. Clinicians working with Black women experiencing sleep problems should assess both stress burden and coping resources simultaneously.
Limitations include the observational design, the young age of the cohort, and the absence of objective sleep measures. Generalizability beyond this specific demographic may be limited.
Key Findings
- Daily prayer and meditation linked to 24% lower nonrestorative sleep prevalence, but only in low-stress women.
- Among high-stress women, religiosity showed no protective effect on sleep quality.
- Over 60% of participants experienced nonrestorative sleep at baseline, highlighting severe sleep burden.
- Spirituality–sleep associations were cross-sectional only; protective effects did not persist longitudinally.
- Short sleep duration and insomnia symptoms showed no significant associations with any religiosity measure.
Methodology
Observational longitudinal cohort study of 1,693 Black women from the SELF study (2010–2018), using Poisson regression and generalized estimating equations. Three religiosity/spirituality exposures and three sleep outcomes were analyzed with stress as a potential effect modifier.
Study Limitations
This summary is based on the abstract only, as the full paper is not open access. The study is observational and cannot establish causation. The cohort consists exclusively of young Black women (mean age ~29), limiting generalizability to older populations or other demographic groups.
Enjoyed this summary?
Get the latest longevity research delivered to your inbox every week.