For a conducive environment for sleeping, one must make sure that the room is dark enough promote sleep. Although this might sound as matter of common sense, there is science behind this reason.  According to the recent study published in the American Journal of Epidemiology, minute exposure to light during sleep can predispose a person into developing depression.

In the study, researchers analyzed the light levels in the bedroom of 863 elderly participants who were also asked to complete a sleep diary.  Over the span of 2 years, it was shown that those who were exposed to a light source during sleep developed symptoms of depression. 73 of the participants were found to be exhibiting the manifestations of depression.

According to the researchers, light exposure could disturbed the body’s internal clock and ultimately impair the release of the sleep hormone melatonin which can significantly affect a person’s mood.

With this in mind, the use of total darkness during sleep is not only a question of being well rested but also a topic of mental health.

Sleep

Light

Melatonin

Depression

Bedroom Light Exposure at Night and the Incidence of Depressive Symptoms: A Longitudinal Study of the HEIJO-KYO Cohort

https://academic.oup.com/aje/article-abstract/187/3/427/4056592?redirectedFrom=fulltext