Background To determine the effectiveness of integrating spirituality into prenatal care on Improving Sleep Quality and Insomnia Severity among Pregnant Women. Methods This randomized controlled trial was carried out on 40 pregnant women recruited at five health centers of zanjan, Iran, 2020. The eligible women were allocated into two intervention and control groups according to the randomized design. Group counselling with spiritual content was carried out in eight sessions, two times a week

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... 16 to 20 weeks of gestation. The control group only received routine care. Data were collected using the Pittsburgh Sleep Quality Index (PSQI) and the Insomnia Severity Index (ISI) questionnaires in three stages, before the intervention, at 28 and 36 weeks of gestation. Statistical analysis was performed using the SPSS 16.0 software (SPSS Inc., Chicago, IL, USA). Results The results showed that comparing the mean score of insomnia severity, sleep quality and its components in the pre-intervention phase was not statistically significant between the two groups(p>0.05). Comparison of the insomnia severity, sleep quality, and its components scores decreased statistically in the second and third trimesters compared to the first trimester in the intervention group than the control group(p<0.05). The effect of the intervention (Eta score) was 64%. Conclusion The results showed that counselling with spiritual content could effectively ameliorate sleep quality and reduce insomnia severity in pregnant women. It seems that the approach is an acceptable basis to design intervention programs in this field that can be considered by midwives.