I am also interested. Buried in the article is a note that by age 6 there was no appreciable difference in children with sleep interventions and without. While

I am also interested. Buried in the article is a note that by age 6 there was no appreciable difference in children with sleep interventions and without. While this article shreds a lot of studies on sleep training, it goes on to cite a lot of others without evidence of equally scrutiny, so who knows.