Nighttime breathing disorders are bad for everybody, even more so for children.

Sleep apnea impairs growth, along with learning skills, social interactions, and long-term health.

Now, a small group of children improved their symptoms after 2 months of tongue training. / Thread

The program had 10 exercises:

1- Pushing Up The Tongue

2-Touching Nose

3- Touching Chin

4- Pushing Tongue Right and Left

5- Folding Tongue

6- Clicking the Tongue

7- Pushing Tongue Against Spoon

8- Holding A Spoon

9- Holding Button with Lips

10-Gargling

The program increased tongue strength from 6% to 76% of normal values. These gains improved chewing and swallowing during eating, along with nose-breathing capacity.

The tongue is a central muscular piece of your face and neck involved in all these functions.

Mouth breathing and abnormal tongue position are two factors found in children with obstructive sleep apnea.

They're also linked with facial growth issues.

The study had limitations, like small sample size, but I'm sure the parents were happy regardless.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092010/