Poor-sleep is associated with slow recovery from lymphopenia and an increased need for ICU care in hospitalized patients with COVID-19: A retrospective cohort study

Highlights
•  Poor sleep is associated with slow recovery from lymphopenia in COVID-19 patients.
•  Poor sleep is associated with increased requirement of ICU care in COVID-19 patients.
•  Poor sleep is associated with prolonged length of hospital stay in COVID-19 patients.

Abstract
Sleep is known to play an important role in immune function. However, the effects of sleep quality during hospitalization for COVID-19 remain unclear. This retrospective, single-center cohort study