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3rd October 2016
05:15pm BST

"When you're tired, the brain is a bit warmer," "So the theory here is that your body is trying to reverse that." sleep expert Daniel Barone explained according to the Washington Post.Not all scientists believe this theory, but because it's not a life or death matter, there hasn't been a huge amount of research into it. Most researchers do agree that yawning actually make you less tired, as your brain is telling you that it is not time to sleep. So next time you and your co-workers all unconsciously start yawning together, remember you're actually all keeping each other awake.

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