For about 5 years I have been using these awesome glasses to block out blue light at night. Why, you may ask? Simply because the blue light that is emitted from computers, phones and tablets is terrible for you at night, it affects the melatonin levels, causes eye strain and headaches. Wearing these glasses can help your body ease into a relaxed state to sleep. If you use your computer, tablet or phone a lot at night, its a good thing to adopt into your regime. I have found my headaches from eye strain at night have completely gone away, Plus my ability to fall asleep has improved since having these on when using devices at night. If you are interested here is a great article by Dave Asprey, a pioneer in biohacking health and creator of Bulletproof, on why these glasses are so important for our health and sleep https://www.bulletproof.com/sleep/tech/blue-light-glasses-sleep/ There are so many brands of these now, but I like these ones as they one of the originals.