When watching TV, especially at night, there are a few tricks that can help reduce the amount of blue light exposure.
 
Turn down the lights in the room – this will help you to see the screen better after the second step, which is
Turn down the brightness display on your TV. Most TVs these days have a wide range of brightness settings you can adjust. You can even save some to set it at your ideal brightness for the nighttime hours with the push of a button
Wear blue light filtering lenses while watching screens. Aferelle Lenses filter blue light , which is where it is most harmful.