Anyone who has a electronic device knows that when battery power is running out on that device, a warning is displayed on screen, and sometimes there is a beeping warning noise to go along as Well. I’m no doctor. But occasionally I play the part as good as anyone can. That being my disclaimer, consider this—Yawning is your body’s way of saying 20% battery remaining.
It may just be you time to get recharge?
Enjoy your day.