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A) Self-reported sleep prior to and during the pandemic (mean 6 SD). Response numbers: Prepandemic sleep need, N = 622; Prepandemic days off, N = 617; Prepandemic work days, N = 617; Late 2020 sleep need, N = 563; Late 2020 days off, N = 558; Late 2020 work days, N = 472; Early 2021 sleep need, N = 107; Early 2021 days off, N = 107; Early 2021 work days, N = 80. B) Frequency of having trouble staying awake while driving, eating meals, or engaging in social activity prior to and during the pandemic. Response numbers: Prepandemic, N = 485; Late 2020, N = 484; Early 2021, N = 85. C) Percentage (6 SD) of flights on which pilots experienced fighting sleepiness prior to and during the pandemic. Response numbers: Prepandemic, N = 624; Late 2020, N = 486 (N = 80, did not fly this month); Early 2021, N = 85 (N = 22, did not fly this month). D) Percentage of respondents using in-flight countermeasures prior to and during the pandemic. Response numbers: Prepandemic, N = 573; Late 2020, N = 384; Early 2021, N = 67.