I've just started CBT to hopefully fix my broken spirit, the article nailed my symptoms. I'm not sure my staying indoors in a darkened room and sighing a lot is helping me to focus on anything though.
Our bodies don't process it in the same way that makes it useful to us.
Which is a shame because I spend 90% of my time indoors.
Everybody, including those described to be mentally healthy, can and should improve and evolve their mind, and CBT can be effective for that.