I knew my cats were the reason I would have trouble breathing most nights when trying to sleep. It would either be a stuffy nose/congested sinuses, or it'd feel like my lungs weren't fully inflating like there was mucus in them, or sometimes just a lot of sneezing. And we would mop the floors, change sheets, and vacuum regularly. We decided to finally bite the bullet and get a quality air purifier for the bedroom. The reading on the air filter when we first turned it on was scary. Just 3 digits below what the manual said was considered "unhealthy air to breathe" (115) and we had been breathing that every night. Within a couple hours the purifier dropped all the way down to 001 and it has consistently stayed under 10 for weeks now. I'm serious when I say I can feel the difference in the air and my breathing has improved greatly when going to bed now.