[Happydude]

yawn are caused due to a lack of oxygen getting into the lungs, so the body forces you to inhale deeply to get enough oxygen...so it is perfectly natural...now as to why it is usually linked to being tired/bored is because when you are in those states you tend to breathe very slowly and your breathing is shallow...so you don't get enough oxygen into your body...and that is why you mostly yawn when you are tired/bored.


so i thinhk this fine was total BS...