STUDY: 28 of 30 children with ADHD were diagnosed with sleep disorders 

Study Title: Sleep phenotypes in attention deficit hyperactivity disorder
Silvia Miano, Ninfa Amato, Giuseppe Foderaro, Valdo Pezzoli, Gian Paolo Ramelli, Lorenzo Toffolet, Mauro Manconi

The direct connection between this study and sub-functional tongue: Sleep difficulties in many children start from a sub-functional tongue that has not “succeeded” in shaping the palate and therefore remains narrow and high, The air remains narrow and thus directly causes breathing problems and hence sleep problems.

Link to the study