I have been using Refresh PM every night since 2000 because I ended up with severe dry eyes after lasik eye surgery. It has really helped keep my eyes lubricated throughout the night. The tube is small but you only need a tiny amount, so each tube lasts about 2 months with daily use. It does not sting when applied. I have also found that it is one of the few lubricants that doesn't leave your vision blurry all night. It coats your eyes and the blurriness leaves in about ten minutes. I have tried several other brands, but my eyes are very dry when I wake up, so I go back to the Refresh PM. I have also used it to remove any mascara and eyeshadow because I don't need to worry if it gets into my eyes. The price for the size of the tube is a little high but average for what this type of lubricant costs. It is available at most stores so it isn't difficult to find. If you have dry eyes this is really a great product for night time use.