Abstract
COVID-19 is
 one of the greatest health issues facing humankind for many decades; it emerged
 in Wuhan, China, late in December 2019, and rapidly spread over the world
 within the short period. This report emphasizes the potential hazards of
 exposure to room light at night which affects the immunity of COVID-19 patients
 by suppressing their melatonin, which is only released from the pineal gland at
 night. Exposure to light at night is especially common in the hospital setting.
 This may make the symptom worse for the hospitalized patients and the light at
 night should not be ignored. Thus, I suggest that COVID-19 patients should
 avoid light at night either by wearing eye masks or darkening the room to
 enhance pineal melatonin synthesis and increase their serum melatonin levels.
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