In this video Mark talks about the effects too much blue light can have on us, from the disruption of the circadian rhythm, insomnia and eye strain. To combat these there are blue light filters built into many devices, which help to block blue light from reaching our eyes.
During the day the sun is the most abundant source of blue light and we have evolved be stay active during the day and rest at night. Prolonged exposure to blue light suppresses the sleep-inducing hormone melatonin and can keep us awake at night.
When the sun goes down and blue light is reduced, melatonin is produced to encourage us to sleep. Unfortunately the use of artificial lighting, smartphones, tablets, laptops and other similar devices ensures we remain exposed to blue light well after the sun has set.
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