In patients with COVID-19 with poor-sleep, the most important etiological causes of poor-sleep were environmental and psychosocial factors, which accounted for 85.3% and 60.0%, respectively. Physical discomfort caused by illness was another major factor that contributed to poor-sleep during hospitalization in patients with COVID-19. These factors are also the major causal factors of sleep disturbance in ICU patients and could negatively affect recovery from critical illness (Delaney et al., 2015, Devlin et al., 2018, Friese, 2008, Kamdar et al., 2012, Pulak and Jensen, 2016). Therefore, psychological treatment (spiritual encouragement, psychological comfort, emotional support, psychotropic drug therapy, etc.), improving the ward environment (reducing noise, improving lighting, segregating patients from each other by curtains, etc.), and interventions to alleviate psychological comfort (adequate analgesia, proper sedation, relieving breathing difficulty, etc.) are essential to improve the sleep quality of patients with COVID-19 in non-ICU wards.