The science that explains these new systems has accelerated over the last 20 years, with the discovery of a new photopigment in the eye, called Melanopsin, in 1998. We know that night-time exposure to blue light makes people more alert and also affects their circadian timing. This effect can be minimized by using dim red lighting in the nighttimeīedroom environment." Blue Light Affects Sleep (and here's why) "Recognizes that exposure to excessive light at night, including extended use of variousĮlectronic media, can disrupt sleep or exacerbate sleep disorders, especially in children andĪdolescents. In 2012, the American Medical Association's Council on Science and Public Health made this recommendation: In 2014, a new study was published in PNAS (full text) that compares the effects of reading an iPad before bed, versus a regular paper book. Manuel Spitschan gives a wonderful overview of how the circadian system responds to light: Enlighten Your Clock Reading on a tablet compared with a book This comic book by Coline Weinzaepflen and Dr. Lecture on "Electrical Units of Measurement" (), published in Popular Lectures Vol. I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be.
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