The science behind the yawn | News for Doctor, Nurse, Pharmacist | General News | MIMS Philippines happens when you wake up – or perhaps after a good, hearty meal – or when you see (hear) someone else is doing it. While yawns are often enough accompanied by the urge to stretch a little – have you ever wondered about the why’s behind this oh-so familiar gesture each time you do it? Although yawning is often thought of as a sign of boredom or tiredness—could there be more to it?