When we are sleepy or feel drowsy, we yawn because our brain cells lack sufficient amount of oxygen. The deep breath associated with yawning helps us to drawn in more oxygen and supply the much needed oxygen to the tired body organs including the brain
Yes, actually they do there is a point when the lady dolphins start to get very sleepy and drowsy because she is going through a growth change.
It shouldn't. If you start feeling sleepy, light headed, etc. whenever you turn on your air conditioning, it may possibly be caused by a refrigerant leak in the evaporator.
The cause in not know.
yawning
melatonin
You can start them whenever, but it is a possibility that your period will be delayed.
whenever you start walking
They are contagious in the sense that other people may start laughing or yawning when they see you doing it, but they are not diseases. I thought that because contagious is derived from the Latin "tangere" - to touch, that both laughing and yawning were infectious. I'm not 100% sure though and would welcome a more knowledgeable answer.
We can start whenever you are ready.
It starts whenever you are ready for it to start.
you will start to feel drowsy and sick so take it easy and slow
Whenever you want!