“…Beyond CV measures, numerous studies have shown that REC sleep after TSD reduced fatigue and sleep propensity, improved neurobehavioral performance, enhanced mood, and returned C‐reactive protein, delta power, and brain age to BL levels (Casale et al., 2023 ; Casale & Goel, 2021 ; Chu et al., 2023 ; Drummond et al., 2006 ; Goldschmied et al., 2023 ; Mantua et al., 2020 ; Stroemel‐Scheder et al., 2020 ; Yamazaki, Antler, Casale, et al., 2021 ; Yamazaki, Antler, Lasek, & Goel, 2021 ). In contrast, REC sleep did not completely reverse the detrimental effects of sleep deprivation on cortisol levels, behavioral attention, and self‐rated vigor levels (Casale et al., 2023 ; Casale & Goel, 2021 ; Yamazaki, Antler, Casale, et al., 2021 ; Yamazaki, Antler, Lasek, & Goel, 2021 ). Discrepancies in how effectively REC sleep restores functions to BL levels may be due to the number of REC sleep days employed, variations in the amount of TIB utilized for REC sleep, or interindividual differences, since differential vulnerability to TSD can affect the amount of REC sleep needed for some facets of functioning to return to BL levels (Casale et al., 2023 ; Casale & Goel, 2021 ; Yamazaki, Antler, Lasek, & Goel, 2021 ).…”