The findings from this study may provide support for the implementation of measures to improve the social support of medical staff during increased demands associated with COVID-19 infection at this time. For example, professional psychotherapy teams should take the initiative to support the mental health of medical staff and provide individually targeted interventions. Hospital managers should provide logistic support for medical staff, and support groups for medical staff should be established. However, this study had several limitations. Firstly, this was a cross-sectional study with a small sample size, and definitive causal relationships remain to be established. For example, anxiety may increase stress, and stress may increase anxiety [36]. However, anxiety has been shown to result in impaired sleep, and poor sleep quality increases anxiety [37]. Therefore, cohort studies with larger samples are needed to investigate the effects of social support on sleep quality and function of medical staff who are working with increased levels of stress and increased workloads, as with the COVID-19 infection epidemic in Wuhan, China. Also, this study used subjective self-reported questionnaires to obtain the data. Future studies should include objective indicators of stress, such as measurements of serum cortisol level with the questionnaire [38].