“Disruption of the melatonin cycle resulting from irregular light/dark pattern exposure or exposure to light at the wrong time can lead to circadian disruption, which has been associated with poor sleep and poor performance,” she says. In diurnal species, like humans, melatonin signals sleep and the body prepares to switch from daytime to nighttime mode.” “It is known as the ‘darkness hormone’ because it tells the body that it is nighttime. Mariana Figueiro, program director at the Lighting Research Center at Rensselaer Polytechnic Institute in Troy, New York. “Melatonin is produced by the brain at night and under conditions of darkness,” says Dr. And it’s that blue wavelength light that wreaks havoc on our body’s melatonin production. Unfortunately, virtually every device we own, from the latest iPad to the Samsung Galaxy Note to Amazon’s Kindle, has light-emitting diodes that give off blue wavelength light.
![night book reader night book reader](https://i.pinimg.com/originals/15/3d/65/153d65ac8b17efde04b72bf701542e81.jpg)
“We know that it is blue wavelength light that is particularly effective at increasing alertness and affecting our body clock, and so we need to minimize the blue/green wavelengths we are exposed to.” Victoria Revell, a senior project manager at the Surrey Clinical Research Centre at the University of Surrey in the U.K. “Light has an acute alerting effect when it is transmitted from our eyes directly to our brains,” says Dr.