FIGURE 2.

Cluster validation to identify subgroups with distinct profiles of changes in sleep behaviours. Validation of the cluster solution: pre‐outbreak to outbreak changes in the sleep behaviour variables included in the cluster analysis (bedtime [lower panel], wake‐up time [middle panel] and time in bed [lower panel]) across the three cluster groups. Error bars indicate the standard error of the mean. Cluster 1: “Extended TiB (Time in Bed)”; Cluster 2: “Reduced TiB”; Cluster 3: “Delayed Sleep” (*p ≤ .001,${\eta }_p^2$ ≥ 0.02)