RETNI, A.; ABDULLAH, F. M. Effectiveness of the Stimulation of Endorphin, Oxytocin, and Serotonin (SPEOS) Method in Improving Sleep Quality among Postpartum Women: A Quasi-Experimental Study in Primary Maternal Healthcare in Gorontalo, Indonesia. Journal of Health and Nutrition Research, [S. l.], v. 5, n. 2, p. 1048–1057, 2026. DOI: 10.56303/jhnresearch.v5i2.1469. Disponível em: https://journalmpci.com/index.php/jhnr/article/view/1469. Acesso em: 6 aug. 2026.