Yawning is more than a sign of boredom or fatigue—it can indicate underlying health issues like sleep disorders, brain ...

Yawning helps cool the brain. It keeps you alert and helps your thinking. Mammals and birds yawn, and just like humans, the bigger their brains the longer they yawn. Humans have yawns lasting ...

Yawning has also been seen in monkeys, birds, frogs and other species. Those animals are believed to yawn to inhale oxygen that reaches their brains and to chase away drowsiness. Dolphins and ...