Dissociated profiles of sleep timing and sleep quality changes across the first and second wave of the COVID-19 pandemic.

No difference was found for mood (W = 5831, p = .508, ES = −0.60), whereas stress levels showed a trend to increase from TL to PL (W = 966, p = .100, ES = −0.200). 3.3 Differences in sleep schedules and sleep quality across the four time-points Table 2 displays average scores of sleep timing and sleep quality variables in the four time-points; comparisons of these variables across time-points are shown in Fig. 1 , Fig. 2 .

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