So I've been breathing through my mouth for 39 years.
After I started doing this quest, I started breathing with my nose. I would sleep every night with my mouth open. I would get thirsty. I would drink water, go to the bathroom. The infinite loop. A few nights I tried to close my mouth and breathe. I couldn't sleep for maybe, like two nights, very difficult, but now I'm completely breathing through my nose. Now I have a very good night's sleep, especially with the meditation for sleeping.
Then I started running. Once, just breathing with my nose after the first kilometer I was dying. So then I stopped. But I came back. I tried again. Then I started playing football. for 190 minutes, no fatigue. No, the tiredness.
This quest changed my life changed my life completely. I get less tired during the day, I do more. It's just like now I'm back to the flow of life.