EASE and/or MMA
After the surgery, he was finally able to get quality sleep, and his personality changed. Before the surgery he was super-intense, slightly ADHD, not doing great in school. All this went away after the surgery, he is just a regular bright kid now. We noticed changes in the first week, took about 2 years to find new normal. Before the surgery, we tried CPAP for a while, and it helped a bit.
My wife also had the same surgery. It helped, but did not completely cure her apnea.