C), nocturnal awakening durations presented a decreasing trend in nine participants (participants 2, 5, 8, 18, 21, 23, 24, 25, and 29), among whom two exhibited significant differences (paticipants 2 and 5, p = 4.7 × 10 −2 and 0.03, respectively, two-sample t -test).
Among all participants, 17.6% exhibited significantly increased BS levels (average and either or both maximum or minimum value) during light exposure compared to before and after exposure (participants 16, 23, and 24); no one showed an increasing trend ( Table 15 ; repeated measures ANOVA, followed by the Tukey–Kramer post-hoc test).
In addition, four participants tended to display reduced sleep latency upon light exposure, although no or only partially significant differences could be observed (participants 4, 23, 24, and 26).