[aicioara]

I had that happening. For me it was an allergic reaction which slightly blocked my sinuses and reduced the air intake. The allergy was previously undetected because I do/did not use the same cosmetic products that my partner uses. A antihistamine nasal spray may help, but check with an ENT.

[co2_throwaway]

Interesting, so does that fall under the category of "mild hypoxia" or something?