Health

Melatonin is a hormone that regulates sleep and wakefulness. Leaving the lights on may even lead to sickness, including cancer. A study showed that women who sleep under higher intensity light have a higher chance of developing breast cancer than those who sleep with the lights off
 
Bright light exposure activates regions of the brain that promote alertness, and improves cognitive performance [3]. Light activates factors that are essential for memory formation [4], as well as factors that are important for the regulation of mood and overall brain health [1]
 
Sleeping in rooms with even a little light can increase risk of depression: Study. The study found that even a little lighting can increase the risk of depression
 
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