don't try at home

Should I try this at a train station then?

First, when you hyperventilate you expel CO2 from your system. Desolved CO2 in blood causes it to be slightly acidic so when you rid yourself of it, it leaves your blood more alkaline. Oxygen uptake into the cells is highly pH dependent and its efficiency degrades with higher pH such as when breathing fast. Second, when on your knees, or squating, your blood circulation adepts to the blood pressure increase. Once you stand up it takes a while for your system to catch on leaving you with a brief moment of low blood pressure. People with POTS (Postural orthostatic tachycardia syndrome) are very aware of these frequent moments of light-headedness. Third, compressing air into your chest cavity (breathing out but obstructing the air) is called the valsalva manoeuvre and overall decreases blood pressure further while decreasing pulse rate. Combining the rapid breathing in a sitting position followed by standing up and the valsalva manoeuvre will cause temporary oxygen deficiency in the brain causing you to pass out. For obvious reason this isn't advisable to do but if you must, then do it with someone present who can monitor you to make sure you fall safely on a soft surface and make sure you lay flat to aid blood circulation and call emergency services if you're not coming to after a few seconds and can administer CPR just in case.

this thing about getting “high” through blood pressure and oxygen manipulation. The technique (don’t try at home):

Where the hell am I going to try it, then??

It seems like your whole life flashed in front of your eyes...alas, you did not die

My salvia experience was like that.

Dude fuck you I think about that all the time. Much of my life lately has odd coincidences that feel as if they're extrapolated from my comatose mind after I got shot in 2018. With on particular lamp I've managed to hold onto since then centering the re-occuring thought.

And the fucked up part is I think I'd honestly be happy if I woke up then.

https://inception.davepedu.com/

man the fuck up and explore the astral plane

Did you know that if you smoke weed every day, you will stop dreaming entirely? It messes with REM sleep, but it's the only way I can get any sleep at all; legalization was a quite a few years ago now where I live so I haven't had a dream in forever.

Just something to consider if you have easy access to cannabis in your jurisdiction.

I found I am way more likely to experience weird, nightmare-ish bs if I sleep on my back, or when I drank some alcohol. Maybe there are factors that control it for you as well.