It’s definitely true what everyone says about blue light disrupting your sleep. After I figured out the blue light was the culprit causing me to take forever to fall asleep I bought some blue light filtering glasses for when I read on the kindle at night and while those work super well (not all do – but I did find a pair that work great), it is very nice to have this already in place on your kindle without having to use the glasses. Not only does this block the blue light, it adds screen protection from scratches, glare and fingerprints. This is a great item and if you buy it now, you can save 5% by clipping the coupon while it lasts.