A descriptive study was conducted to examine the relationship between social support and adaptation to sleep by Southern Taiwan hospitalized adults. The conceptual framework for this study was based on Roy's adaptation model and social support as a beneficial factor in health and well-being. Sixty-one hospitalized adults, ages 20 to 71 years, participated in this study. Sixteen subjects (26.2%) had a supportive person stay with them. Data analysis showed that only daytime sleep items of the supplementation factor were significantly different between the supported and unsupported groups. However, all the mean values of effectiveness items in the supported group were higher than those in the unsupported group. It is recommended that a larger sample size from diverse hospitals in Taiwan be used to repeat the study.