Question

Why do we yawn when we are sleepy or drowsy

Answer 1

Yawning consists of more percentage of carbondi

Answer 2

Answer:

Our body gets tired and it tends to take rest or sleep. When we feel sleepy rate of respiration slows down. Because of this lungs will not get enough oxygen and we yawn. Yawning bring extra oxygen to the lungs and helps us in being awake.