COVID-19(39) Insomnia(12) Narcolepsy(10) Symptom(10) Sleep(9) Patient(8) Infection(7) Research(7) IMPROVE(7) reported(7) Sleep quality.(7) Treatment(6) Sleep disturbance(6) Depression(6) SARS-CoV-2(6) pandemic(6) COVID-19 pandemic(6) Anxiety(6) renal system(5) mental health(5) addition(5) consequence(5) obstructive sleep apnea(5) risk factor(5) COVID-19 patients(4) Laboratory(4) Mental(4) Admission(4) hazard ratio(4) were used(4)