Most nurses work in shifts to deliver 24-h patient care globally (Pélissier et al., 2020). In South Korea, 82.1% of nurses in hospitals work in an eight-hour rapid rotating-shift system (i.e., different shifts every two to three days), including night shifts, and 2.8% work 12-h rotating shifts (Hospital Nurses Association, 2020). Shift work, especially night shifts, can induce fatigue in nurses owing to insufficient sleep and inadequate recovery time between shifts, thus affecting their abilities to provide high-quality care for patients owing to declined alertness (Ganesan et al., 2019;Min et al., 2021;Trinkoff et al., 2011). The decline in alertness from sleep deprivation is equivalent to the effects of blood alcohol concentrations (BAC) of 0.05%-0.1% (James et al., 2020). This is described as sleepiness (Geiger-Brown et al., 2012) and/or vigilance (Geiger-Brown et al., 2012) in previous literature. Scott et al. (2006) indicated that 65% of critical care nurses struggled to stay awake during their shifts, and 20% had fallen asleep at least once. Notably, more than half the nurses