A.D.H.D., Diagnosing the Wrong Deficit?

In the Sunday Review, Vatsal G. Thakkar questions if a substantial proportion of A.D.H.D. cases are really sleep disorders in disguise. My assertion is, no. 

Access to the NY Times article link and my clinical opinion can be found here: 

http://www.dradatya.com/adhd-diagnosing-the-wrong-deficit/