Their study was designed to determine if there were any links between hospital lighting, mood, sleep and pain in adult patients. Twenty-three women and 17 men in a large U.S. hospital had their light exposure levels and sleep-wake cycles continuously monitored over 72 hours.
The patients’ moods were checked daily through questionnaires, and their pain levels determined from medical records, according to the study published online recently in the Journal of Advanced Nursing.
The patients were exposed mainly to low levels of light 24 hours a day and lacked the natural fluctuation between bright and low light required to help maintain normal sleep patterns.
The patients slept poorly, and the less light they were exposed to during the day, the greater their levels of fatigue. The more fatigued they felt, the more pain they had.
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