I really appreciate Carl's sister Jenn for bringing this to my attention. This video demonstrates how our children, some even teenagers, do not hear the smoke alarms when they are sleeping. This is something you can be sure I will be testing in the next few nights. I had no idea, although I should have known this all along. My children could sleep through a hurricane! The report also states that there are new alarms coming on to the market that you can program with your own voice. I will post when I find more information on this.