Does yawning indicate a lack of oxygen? Researchers initially thought that yawning might mean you lack oxygen, but more recent evidence suggests this is untrue. Yawning doesn't mean you lack oxygen or your body is trying to get more oxygen.

Yawning is a common but perplexing human function. Scientists have several theories for why we yawn, but none of them are certain. Common triggers of yawning include tiredness, boredom, waking up and stress. Seeing or hearing other people yawn can also cause you to yawn.

: to open the mouth wide and take a deep breath usually as an involuntary reaction to fatigue or boredom. yawn. 2 of 2 noun. : an opening of the mouth wide while taking a deep breath often as an involuntary reaction to fatigue or boredom.

The stereotype that people that yawn during a conversation are bored or not interested in the conversation is false. In contrast, the study suggests that people yawn to keep their brains in working order, which is quite important during a conversation.