Excessive yawning may simply mean that you’re tired, drowsy, or fatigued. However, it can also be a sign of a medical condition, such as sleep apnea, narcolepsy, or a reaction to a medication.

Why Do People Yawn More When They Feel Tired. A tired brain is an inefficient one, and its energy levels go down. Thus, the body might resort to yawning as a weapon against fatigue.

“Yawning often occurs when we’re tired – likely as a mechanism to increase oxygen intake and regulate brain temperature,” explains Dr Ann Nainan, a GP and founder of The Travelling Doctor.

While someone who yawns may be tired, the heart rate quickly rises during a yawn. ... Yawning may cool the brain. A yawn causes the jaw to stretch out, increasing blood flow in the face and neck.

Reason why we yawn so much when tired - and when to be worried. Although the exact science behind yawning is not yet 100 per cent clear, there are plenty of theories behind this everyday bodily ...

Scientists from City St George’s, University of London created a terrifyingly realistic android head to determine whether ...

Is It Normal to Yawn During Workouts—Even When You’re Not Tired? Here’s the science behind why you may be yawning during workouts, and what to do about it if you want the yawns to stop.

Some people only yawn when they’re already tired, regardless of who else is yawning around them. This suggests a more self-focused emotional system that prioritizes internal states over external ...

When feeling tired or sleepy, one of the body's most common responses is yawning. But why do all humans do this? And when can too much yawning be a cause for concern? Although the exact science ...