because your tired
while sleepy CO2 accumulation increase and to get rid of it we yawn.
When I am sleepy or tired I yawn.
You yawn when you are sleepy because that is when you take in the least oxygen. Your body takes in more oxygen when you are yawning, which explains the reason to why you take in air when you yawn.
because your mind is not concentrated so you yawn to show you to go to bed
yawn and say I'm getting sleepy are you tired
while sleepy CO2 accumulation increase and to get rid of it we yawn.
When I am sleepy or tired I yawn.
You yawn when you are sleepy because that is when you take in the least oxygen. Your body takes in more oxygen when you are yawning, which explains the reason to why you take in air when you yawn.
Yes when they are sleepy and tired
because your mind is not concentrated so you yawn to show you to go to bed
because your mind is not concentrated so you yawn to show you to go to bed
yawn and say I'm getting sleepy are you tired
When you yawn it doesn't mean your sleepy. Even scientists don't know why you yawn.
because your sleepy too.
yes because its saying to go to bed!
You only tend to yawn when you're very sleepy or when your listening/watching something very boring that you're not interested in. You can't really choose when to yawn.
When two people yawn at the same time means one is sleepy. The other is just copying the other.