[unrealp]

https://en.wikipedia.org/wiki/Hyperventilation - This leads to hypocapnia, a reduced concentration of carbon dioxide dissolved in the blood.

https://en.wikipedia.org/wiki/Hypocapnia - Acute hypocapnia causes hypocapnic alkalosis, which causes cerebral vasoconstriction leading to cerebral hypoxia

Though not acute, you can see the effects very easily. Within couple of minutes of deep breathing we could create peripheral numbing and tingling effect. (yoga folk say you are feeling energy moving though body and that kind of stuff haha)

[ay]

Thank you! The second link was the missing one for me ;-)

I did a breath work session once out of curiosity, but it was so much voodoo talk and so much obvious exploitative power dynamics from the “guru” after the session, I could barely hold my disgust. (But yeah, I got both tingling and cramps on top of that)

Deliberately reducing the oxygen to the brain sounds like a not so good plan to me, regardless of what it is caused by…

I recently acquired the pulse oximeter that can be worn during sleep, and the correlation of oxygen levels during the night with how I feel in the morning is seemingly pretty strong.