Respuesta :

TwixCPA8
Not necessarily. I yawn when I'm tired, and whenever someone else yawns. Yawning is contagious.
monicatowa8
Not exactly. Some people yawn when they wake up (I do). Sometimes, people just yawn because they just yawn. Yawning doen't scientifically mean you NEED to sleep during that time. 

Otras preguntas