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

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]