I did have the exact thing happen to me during my pregnancy a couple of years ago. I totally freaked out about it and asked by Dr but apparently it can be quite normal during pregnancy. I can't remember the reason that was given to me at the time but it all ended up good.
I have the same exact thing happening to me. I'm only 25 & this is my 1st pregnancy. I can sleep on my left side without any part of my body falling asleep but when I sleep on my right side my left arm falls asleep....every time. It's been happening for about 2 weeks now. I haven't gotten an answer for it yet. But going to ask my dr when I see her on the 4th.
I have something similar. If I sleep on my RIGHT side, my LEFT hip and thigh go to sleep!! go figure. I prefer my right than my left. Just another thing we have to love about pregnancy.
I haven't had that happen, but when I am sitting for any period of time, I get tingling and numbness in my left foot, particularly toes. It's not like I am in a weird position and my foot would be falling asleep, so I think it has something to do with pregnancy as well. I wonder if the babies position is not sometimes affecting certain nerves or something? I don't know if that can happen, just speculating.