Having delt with the death of my father in law as a result of co poisoning, I can affirm, these warnings should be taken seriously! Don't be surprised if law enforcement try to make it appear as murder either, they tried to pin it on my mother in law. It took place on their house boat, he went to bed and never woke up. We almost lost her too, she spent 4 days in the hospital. Determining your father in laws death, is not a fun way to spend a day! Check your detectors, and make sure to change the battery, it's chirping for a reason!