Im glad u asked, that happened to me this morning.
This is pregnancy induced carpal tunnel, pretty common. It's from the swelling. Puts a lot of pressure on the carpal vein. That's how mine started, now I can't feel anything from my knuckles to my finger tips. Doctors said it will start going away after baby is born. I sleep with wrist braces.
I sleep with my hand/arm under my pillow and have been waking up with numb hands since idk when lol.
I don't think so but it's something to ask your doc
Probably either a pinched nerve or weak circulation. I get that when I lay on my sides too. Or stomach