Violet light could improve sleep quality and blood glucose levels in healthy individuals: A pilot study.

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).

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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).

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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).

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