Why are yawns contagious?

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Why are yawns contagious?

2006-06-30 03:32:03 · 3 answers · asked by under_score1490 2 in Health ➔ Mental Health

3 answers

First of all, you yawn because your brain is not getting enough oxygen. When you exhale in a yawn, you produce a lot of CO2, which temporarily lowers the oxygen in the room, therefor, other people around you yawn because of a lack of oxygen.

2006-06-30 03:43:48 · answer #1 · answered by Raelle 3 · 0⤊ 0⤋

Subconscious reflection cause by vision .

2006-06-30 03:42:17 · answer #2 · answered by ace y 1 · 0⤊ 0⤋

LOL....thats a good question!!! I have always wonder that 2.....I really don't know why it is...Its just one of those things I guess!

2006-06-30 03:43:07 · answer #3 · answered by Anonymous · 0⤊ 0⤋