Fig 6. Differences between work and free days in sleep timing (social jetlag) and sleep duration.

[A]. Absolute value of differences between work and free days in sleep onset, midsleep, and sleep end in the archive (grey diamonds) and 2020 groups (red circles). Variables within groups that share a letter (a or b) are significantly different from each other by Friedman test (archive group N = 422, χ²₂ = 256.7, p < .0001; 2020 group N = 55, χ²₂ = 32.2, p < .0001). [B]. Absolute value of differences between work and free days in total sleep time. In panels A and B, differences between groups are not significant (Mann-Whitney U tests).