Where can I learn about Restorative yoga research?

Visit Yoga Alliance https://www.yogaalliance.org/About_Yoga/Yoga_Research for a compilation of yoga research on a variety of topics. Visit PubMed Central https://www.ncbi.nlm.nih.gov/pmc/ to search for medical research on the effects of yoga. Below are samples of the types of studies you will find there: Corey, Sarah M et al. “Effect of restorative yoga vs. stretching on diurnal cortisol dynamics and psychosocial outcomes in individuals with the metabolic syndrome: the PRYSMS randomized controlled trial.” Psychoneuroendocrinology vol. 49 (2014): 260-71. doi:10.1016/j.psyneuen.2014.07.012. Danhauer, Suzanne C et al. “Restorative yoga for women with breast cancer: findings from a randomized pilot study.” Psycho-oncology vol. 18,4 (2009): 360-8. doi:10.1002/pon.1503. Kanaya, Alka M et al. “Restorative yoga and metabolic risk factors: the Practicing Restorative Yoga vs. Stretching for the Metabolic Syndrome (PRYSMS) randomized trial.” Journal of diabetes and its complications vol. 28,3 (2013): 406-12. doi:10.1016/j.jdiacomp.2013.12.001.