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Table 2 Some beneficial health effects of light exposure reported in the literature

From: The effect of light on critical illness

Light can alleviate seasonal depression [74]
Sunlight exposure improves cognitive function among depressed people in a dose-response relationship [75]
Light regulates melatonin, which has paramount immunomodulatory effects and has been shown to reduce breast cancer growth [20]
Female patients with a first cardiac attack treated in sunny rooms had a shorter stay than female patients treated in dull rooms and mortality in both sexes was consistently higher in dull rooms than in sunny rooms [76].
Absence of visible daylight in the room is significantly associated with delirium and higher risk of dementia in intensive care patients [77]