My family has a reputation for being sound sleepers. Honestly, it takes being shaken almost violently for me to wake. When I was 11, we installed a home security system and since we knew we were sound sleepers, we had the company install a bullhorn behind the walls of each of our bedrooms. I didn't really know what to expect, so I used something similar to theseevery night just in case the thing went off. Two years later, somebody tried to break into our house and let's be honest here. I could have welded those plugs into my ears and I still would have heard that freaking alarm without any trouble at all. In fact, when it's quiet, to this day I can still hear that piercing noise ringing in my head.