Is it from the extra blood flow?

So this isn’t my first rodeo however I’ve never put 2 &2 together. I’m noticing if I have my arms bent in the night the fall asleep like that tingling sensation. It’s really anytime my arms are bent for awhile but laying down I notice it happens pretty quick. I need my arms straight down or else it happens. Even laying with my arm straight up like under my pillow with no bend it happens. I am thinking it’s from all the extra blood flowing but I could b wrong. I noticed it with my second son but do not remember with my first at all. Is anyone else experiencing this or have?