These play an important role in resetting your circadian rhythm properly. They emit blue light directly onto your retina to wake you up. They need to be worn for the allocated time only, to ensure that your sleep for that evening is not affected
Filtering out the type of light that keeps you awake is essential to the natural sleep process. If you are dependent on wearing glasses for most tasks, you can use these extra-large over shades. You simply slip them over your normal glasses.