Yawning is a reflex that helps to regulate the oxygen and carbon dioxide levels in your body. It’s a natural and involuntary action, but you can encourage yourself to yawn by following these steps:
Relax your jaw
Open your mouth wide, and stretch your jaw muscles as far as you can.
Take a deep breath
Inhale deeply through your mouth, filling your lungs with air.
Hold your breath briefly
Hold your breath for a few seconds, then exhale slowly through your mouth.
Repeat
Repeat the deep breathing and breath holding a few times, and you may find that you start to yawn naturally.
It’s important to note that trying to force yourself to yawn may not be effective, and yawning is a natural response to a variety of stimuli, such as fatigue or boredom. So if you’re having trouble yawning, it’s best to simply relax and let it happen naturally when your body is ready.