Why do all the animals including humans yawn? Especially while sleepy or while walking up after one.

Question

Title says it all…

In: 7

Answer 1

I’ve yawned reading the comments. Not because it is boring, it’s because I keep imagining myself yawning every time I read the word “yawn” all over. Thanks for all the new knowledge! Plus I haven’t seen anyone mention infectious yawns, just like an infectious laugh, yet.

Answer 2

I’ve yawned reading the comments. Not because it is boring, it’s because I keep imagining myself yawning every time I read the word “yawn” all over. Thanks for all the new knowledge! Plus I haven’t seen anyone mention infectious yawns, just like an infectious laugh, yet.

Answer 3

If I am not mistaken, a yawn is caused by the increased concentration os CO2 in the blood which triggers a sudden muscular relaxation to force more oxygen into the body to restore the oxygen levels to normal.

Answer 4

If I am not mistaken, a yawn is caused by the increased concentration os CO2 in the blood which triggers a sudden muscular relaxation to force more oxygen into the body to restore the oxygen levels to normal.