Please help and quickly, I’m giving out 100 points :)
Read this sentence from the conclusion: While this behavior still is largely a mystery, one thing is certain: you are probably fighting the urge to yawn right about now. Which line from the text shows what the author means by “you are probably fighting the urge to yawn right about now”? We also know how to make machines and devices that make life easy for us. Recent studies suggest that we yawn when we get tired as a way to encourage our brains. This kind of behavior is called "contagious yawning" Also a deep breath during the yawn forces spinal fluid and blood down from the brain.