We put them on after the sun goes down each night to block the blue light from computer screens, television, and phones. (wellnessmama.com)
By blocking blue light in the evening, you can prevent the disruption in the natural sleep - wake cycle caused by artificial lighting and electronics. (healthline.com)
A large number of companies offer apps that do block blue light, and have been found to enhance quality of sleep. (strengthsensei.com)