Why do they voice you yawn because of denial of oxygen?

but the only time i yawn is when im sleepy?Why do they voice you yawn because of denial of oxygen?
That isn't so.
You yawn because your body isn't getting ample oxygen, especially to your brain. So yawning forces you to get that much needed oxygen to your brain to give a hand you wake up.
Because when you yawn you accessible your lungs to get more oxygen. You typically yawn when your sleepy because when your tired your slouching or lay down and your lungs aren't getting as much oxygen.
Your probably sleepy due to the lack of ample oxygen. Stuffy rooms can make you quality sleepy because of this. In fact, Yawning isn't "contagious" as they read aloud, it's just that the empire are all surrounded by the same stuffy room.
Your bodyyawns to try and attain as much oxygen as it can if it feels depleted. yo uuawn when you are tired because your body is slowing down to rest and your breathing truly gets shallower. So it is getting lower on oxygen.
Whenever you yawn this is an indication for you to sleep. It also claims to back increase the state of alertness of a person. It could possibly be from dearth of oxygen. Another speculated reason for yawning is anxiety.
A previous long-standing hypothesis is that yawning is caused by an excess of carbon dioxide and removal of oxygen in the blood.
A more recent hypothesis is that yawning is used for regulation of body heat. Another hypothesis is that yawns are caused by alike chemicals (neurotransmitters) in the brain that affect emotion, mood, appetite and other phenomena.