Don't think about not yawning; it will likely cause you to yawn.
When you sign, you produce music with your voice by manipulating the tone and rhythm that you produce. Singing can be done for fun--such as singing in the shower or singing karaoke--or it can be done for formal occasions--such as religious gatherings or professional performances. Regardless of the reason, some people run into problems when singing, with one often unmentioned problem being yawning when singing. This is not a sign of being uninterested or tired. Though the true cause for yawning is still not scientifically known, most speculation points to your body trying to take in more oxygen. The yawning can be slowed or even stopped with the use of a few techniques before and while you are singing.
Instructions
1. Breathe deeply for 5 to 10 minutes before you sing. Try to breathe in for 6 seconds, hold this breath for 1 second and then exhale for 4 seconds. Repeating this breath pattern before you sing will help your lungs feel oxygenated and will reduce yawning.
2. Don't think about yawning before or while you are singing. Yawning is contagious, and seeing someone else yawn or even thinking about yawning can make you yawn more frequently.
