Fig. 3.

Antarctic impact on chronobiological parameters: midsleep point (A), sleep duration (B), waking time (C), and sleep onset (D). Box plot representation of each parameter compared among the three phases (pre-Antarctic, Antarctic, and post-Antarctic) through Kruskal–Wallis one-way analysis of variance by ranks and multiple comparison of mean ranks for all groups (middle point: median; box value: percentiles 25–75%; whisker value: minimum–maximum). The post-hoc test is presented above the box values using the letters “a”, “b” or “c” to represent the significant differences for each phase.