A controlled study of dawn simulation in subsyndromal winter depression

Acta Psychiatr Scand. 1993 Jul;88(1):67-71. doi: 10.1111/j.1600-0447.1993.tb03415.x.


In a randomized, cross-over design, 16 subjects with recurrent autumn-winter symptoms but without major depression were treated with 4 days of dawn simulation consisting of a gradually increasing illuminance over 45 min peaking at 100 lx (slow dawn) and with 4 days of a light rapidly increasing over a 4 s period to 100 lx (rapid dawn). The slow dawn was significantly better than both baseline and the rapid dawn in improving subjective measures of energy, mood, social interest, productivity, quality of sleep and quality of awakening.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Cross-Sectional Studies
  • Female
  • Humans
  • Light*
  • Male
  • Middle Aged
  • Phototherapy
  • Psychiatric Status Rating Scales
  • Seasonal Affective Disorder / diagnosis
  • Seasonal Affective Disorder / psychology*
  • Seasonal Affective Disorder / therapy
  • Sleep Wake Disorders
  • Wakefulness