I really enjoy earing these ear plugs to sleep. I started wearing these back in the mid 90's. When you have really noisy neighbors who don't give a crap about anyone, you can complain and wait for the authorities or you can complain and wear ear plugs. I did just that. I called the police and put these ear plugs in my ear and went right to sleep. Ever since then I have been using ear plugs to relax and rest. You almost feel like you're in a world by yourself. I've used them to study and just when I wanted some time alone. There are different types of ear plugs. The big ones feel very uncomfortable to me so I stay away from those. The smalls ones are too comfortable and I fear them going all the way in my ear so I leave those alone as well. I found these Hearos ear plugs and when I tried them, I was satisfied. You're able to tune out so much unnecessary noise it's amazing. Ear plugs don't tune out noise completely it just minimizes it so that noise becomes bearable. I am interested to see how effective these ear plugs are on an airplane to Puerto Rico!