PMID: 9449059Jan 1, 1997Paper

Nocturnal light effects on menstrual cycle length

The Journal of Alternative and Complementary Medicine : Research on Paradigm, Practice, and Policy
K M RexM R Klauber

Abstract

In previous University of California, San Diego (UCSD) studies, nocturnal illumination shortened menstrual cycles that were longer than 33 days. The studies reported here extend the previous findings, confining the illumination to the sleep period. Two light levels (235 to 250 lux and less than 1 lux) and 2 modes of light delivery (lighted sleep mask and bedside lamp) were tested. 235 to 250 lux treatment cycle lengths were significantly shorter than baseline, but not significantly shorter than the less than 1 lux treatment cycle lengths. Subjective reports of sleep disturbance were greater with the 235 to 250 lux treatment, but there was no significant difference in overall quality of sleep between the two light levels. The current data alone do not exclude spontaneous remission or suggestion, but our previous studies demonstrated significant contrasts between 235 to 250 lux and less than 1 lux light levels. This study suggests that treatment may be effective when confined to the sleep period, and that light masks, which do not disturb bed partners, may be used in place of bedside lamps.

Associated Clinical Trials

References

May 1, 1978·Photochemistry and Photobiology·E M DewanJ Rock
May 1, 1992·British Journal of Obstetrics and Gynaecology·K MünsterP Helm
Aug 1, 1990·Psychiatry Research·M C LinS L Berga
Feb 5, 1968·JAMA : the Journal of the American Medical Association·L ChiazzeB J Duffy

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Citations

Oct 24, 2019·Current Opinion in Endocrinology, Diabetes, and Obesity·David Stock, Eva Schernhammer

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