The human body is programmed to be awake during the light of daytime, and asleep during the darkness of the night. This is due to a chemical process in our bodies – it starts when the light penetrates our retinas signaling to our brain that it must stop producing melatonin, the hormone that makes us tired and drowsy. Opposite, when the surroundings are dark, the brain increases the production of melatonin, so that we can get a good night’s rest.
Before the invention of artificial light, people’s circadian rhythm was mostly following the sun, however nowadays, artificial light has a significant impact on the sleeping habits of the modern human being. The National Institute for Occupational Safety and Health (NIOSH) state that exposure to blue light, hereunder white light, can make it difficult for us to fall and stay asleep.