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Morning blue light can advance the melatonin rhythm in mild delayed sleep phase syndrome

We investigated the effectiveness of morning blue light in advancing the sleep and melatonin rhythm of individuals with mild delayed sleep phase syndrome. The participants (n = 18) were randomly allocated to a light or control group. Wake-up times were gradually advanced to 06:00 hours over a week, during which the light group also received two hours of blue light immediately after waking. The blue light group showed a significant 2.53-h advance of dim light melatonin onset, compared to no change in the control group. However, neither group had a significant advance of sleep times following treatment. Effective delayed sleep phase syndrome treatment may require adjunct behavioral instructions.