Effects of self-reported sleep quality on recovery from lymphopenia. Dynamic changes in absolute lymphocyte count (ALC; A) and neutrophil-to-lymphocyte ratio (NLR; B) within 24 h (baseline value), on day 7, 14, and 21 after hospital admission in patients with COVID-19 in the good-sleep and poor-sleep groups. Dynamic changes in the ALC recovery rate (C) and NLR deterioration rate (D) on day 7, 14, and 21 after hospital admission in patients with COVID-19 in the good-sleep and poor-sleep groups. Data were missing in five patients (8.3%) on day 7, and three patients (5.0%) on day 21 in the good-sleep group. Data were missing in five patients (6.6%) on day 7, three patients (4.0%) on day 14, and four patients (5.3%) on day 21 in the poor-sleep group. ***P < 0.001 and ****P < 0.0001 when compared to the baseline value of the good-sleep group; §§P < 0.01 and §§§§P < 0.0001 when compared to baseline values of the poor-sleep group; ##P < 0.01 and ###P < 0.001 when compared to values on day 7 in the good-sleep group; &&P < 0.01 and &&&P < 0.001 when compared to values on day 7 in the poor-sleep group; N.S., not significant. P < 0.05 was considered statistically significant.