Figure 1 Heat map analysis of factors related to sleep disorders. Statistical analysis of correlation coefficients between sleep disorders and related factors. The color of the bars shows the statistical value. BMI – body mass index; ESS – Epworth Sleepiness Scale; PSQI – Pittsburgh Sleep Quality Index; TST – total sleep time; WBC – white blood count; HGB – hemoglobin; HCT – hematocrit; NLR – neutrophil to lymphocyte ratio; GLU – glucose; SCR – serum creatinine; ALT – alanine transaminase; TP – total protein; ALB – albumin; TBIL – total bilirubin; DBIL – direct-reacting bilirubin; ProBNP – pro-brain natriuretic peptide; CRP – C-reactive protein; IL-6 – interleukin 6; ESR – erythrocyte sedimentation rate; ICU – Intensive Care Unit.