Just a subject of conversation I came up with because I can’t sleep. Why exactly are we breathing in lucid dreams? To quote Morpheus (because I’m lame like that) “You think that’s air you’re breathing?” I’d like to see some people stop breathing or try holding their breath for rediculous amounts of time in a dream, and see what the result is. I’ll try it myself when I get the chance for sure, but I’m not really that great at lucid dreaming at my whim (who is?) Well, the next time anyone out there is lucid, jump underwater and start breathing, hold your breath forever, do whatever, I’d just like to know if you still get the urge to breathe as you normally do or what.
In dreams, if i hold my breath i still have the urge to breathe, but only by me holding my breath is it possible to achieve that because in dreams I can breathe underwater
Personally, I’m not sure it would work 
. Why, you ask? What if breathing in the dream is linked to RL breathing, like eye movement 
?
Just my two cents 
(don’t listen to me, I’m not experienced or anything).
My breathing in dreams has always been linked to my normal breathing. Always. In fact, I’ve actually been able to use this knowledge to go lucid in a few cases involving water. Whenever I’m underwater for whatever reason, I still breathe normally, and if I realize that I’m breathing underwater, I’ll realize I’m dreaming. I don’t always catch it, though.
i think for the subconcious things like breathing, you do in both the dream world and in the waking world, thus if you were to try to hold your breath in a dream, you would probobly wake up.
Well alright, at that let’s move this topic to the next partially involuntary function: blinking. There’s no way blinking can be connected to reality; your eyes aren’t even open. However, I can’t really say I’m sure you even blink in your dreams, it’s something that’s pretty hard to notice even in waking life.
I find blinking very distracting in dreams, it has caused me to lose focus and wake up many times (though some those were FA )
this is an interesting area of inquiry
i will try both breath holding and blinking in my dreams.
*one way to master lucidity is to sit in a comfortable chair and reverse blink, working to see an after-image of reality so that, after intense practice of reverse blinking, closing your eyes creates an entire vivid after-image so long and persistent that you can step into it, i.e., a dream
its the same idea as reverse blinking at a candle to open the third eye, opening the eyes for a fraction of a second and snapping them shut, as if you were a camera, when the candles after-image seems to fade.
this takes complete and total patience.