Apparently sleeping on your side can temporarily paralyze you if you do it the right way. I wasn't able to move my arms below the shoulders for 3-4 hours yesterday. I got worried as fuck, went to the doc, and they told me it could be a progressive disease where you eventually become close to a vegetable. Then after hours, vials of blood, and cat scans, she was like, "do you sleep on your side?"

Lesson learned!