[AdrianB1]

The "changed my life" is probably "I have one more thing to focus on for a while". As humans emit CO2 and your lungs are full of it, the danger exists if you run out of oxygen and get too much CO2, the kind of situation where you can get indoors only if you tape all your doors and windows creating an airproof seal.

[maxk42]

It solved a chronic lethargy problem that resulted in me falling asleep randomly at inappropriate hours at home.

Literally -- not figuratively -- changed my life.