Avery D H, Khan A, Dager S R, Cox G B, Dunner D L
Department of Psychiatry and Behavioral Sciences, School of Medicine, University of Washington, Seattle.
Acta Psychiatr Scand. 1990 Nov;82(5):335-8. doi: 10.1111/j.1600-0447.1990.tb01397.x.
In a randomized crossover design, 7 patients with winter depression were treated with 7 d of bright morning light (0600 to 0800) and 7 d of evening light (2000 to 2200). Bright lights in the morning significantly reduced the Hamilton Rating Scale for Depression (HRSD) score (18.4 to 5.0); the bright light in the evening moderately decreased the HRSD score (19.4 to 15.1). The improvement in the HRSD score was significantly greater with morning light than with evening light.
