There is no scientific consensus on why we yawn or even what exactly is causing us to yawn. We know that being tired can trigger a hefty yawn, but so can sheer boredom, and because yawns are contagious they can travel across the room even to well-rested individuals. So enjoy the mystery behind your next yawn, and see how far you can spread this odd behavior. 🥱 #restful #investinrest #sleepmatters #bedtimebulb