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Sleep (dark bars) of 4 representative subjects of this study across the 3 phases (5 weeks): pre-Antarctic (black bars), Antarctic (gray bars) and post-Antarctic (black bars). Weekend nights are indicated at the sides of the graphs (FRI/SAT). * indicates the night of the Antarctic party. Vertical lines indicates darkness onset (black line) and its end (light gray line). Note photoperiod differences between phases (pre and post-Antarctic vs Antarctic).
