Last night I was trying to keep my mind alert while going to sleep by focusing on what I wanted to dream about and counting my breaths. I was awake for around 1.5 hrs just laying there feeling my body go into paralysis but suddenly after laying there not quite yet in a dream state but seeing visions my arms flew into the air and flailed about.

That has never happened to me before and I couldn't believe how funny it was. It was like your legs twitching when you dream only my arms and up in the air flailing for a few seconds.