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KSS scores for the Early Group after experiencing both light interventions. Compared to the baseline week, the Early Group reported feeling significantly sleepier during the advancing light intervention at waking (p = 0.002), at 2000 (p = 0.0007), and at bedtime (p < 0.0001) and significantly less sleepy after the delaying light intervention at bedtimes (p < 0.0001).
