Typically "melatonin glasses" are orange or amber in color, because experience has proven that this IS usually BLOCKING ENOUGH AGAINST EVENING ARTIFICIAL LIGHTING. BUT WHAT ABOUT NATURAL MORNING SUNLIGHT? Natural sunlight exposure is many times brighter than artificial lighting. The night shift worker often leaves work with a punch of sunlight telling their brain to RESIST melatonin onset and sleep. These red glasses not only block blue light, but green and yellow light, to safeguard that even those bright MORNING sun-birthed colors don't shut off melatonin onset, which onset needs to start a few hours before you fall asleep. Click on the picture above to see all of the varieties of frames for the morning-time user. To be used a few hours before and/or when the night shift worker leaves work, to entrain melatonin onset a few hours before attempting sleep. {KEEP YOUR SLEEP SPACE AS DARK AS POSSIBLE, ALUMINUM FOIL WINDOWS, SHOVE MATERIALS UNDER DOORWAYS, DO WHATEVER IS NEEDED TO PREVENT LIGHT FROM ENTERING INTO YOUR SLEEPING SPACE}