Open AccessMorning vs Evening Light Treatment of Patients With Winter Depression
Author(s) -
Alfred J. Lewy,
Vance K. Bauer,
Neil L. Cutler,
Robert L. Sack,
Saeeduddin Ahmed,
Katherine H. Thomas,
Mary L. Blood,
Jeanne M. Jackson
Publication year - 1998
Publication title -
archives of general psychiatry
Language(s) - English
Resource type - Journals
eISSN - 1538-3636
pISSN - 0003-990X
DOI - 10.1001/archpsyc.55.10.890
Subject(s) - evening , morning , circadian rhythm , melatonin , light therapy , crossover study , depression (economics) , medicine , psychology , placebo , physics , alternative medicine , pathology , astronomy , economics , macroeconomics
According to the phase-shift hypothesis for winter depression, morning light (which causes a circadian phase advance) should be more antidepressant than evening light (which causes a delay). Although no studies have shown evening light to be more antidepressant than morning light, investigations have shown either no difference or morning light to be superior. The present study assesses these light-exposure schedules in both crossover and parallel-group comparisons.
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