5 Weird Involuntary Behaviors Explained!

Why we yawn, why we hiccup, twitchy eyes (and more)! Don’t miss our next video! SUBSCRIBE! ►► ↓ More info and sources below ↓ Follow on Twitter: Follow on Tumblr: Follow on Instagram: Our bodies do a lot of weird things, and many of them are completely involuntary. Why do we often jerk our bodies awake right before falling asleep? Why do we yawn? Why do we hiccup? Why do some people s