Dan Torrance.

Dan Torrance is the main character of novel Doctor Sleep. He is the son of Wendy and Jack Torrance. Following the events of The Shining, Danny Torrance remains psychologically traumatized. Now he is 40 years old. He takes up his father's legacy of anger and alcoholism but then he gaves it up with help of  Alcoholics Anonymous meetings. He gets a job at a hospice. His "shining" abilities become stronger and he uses them to relieve people's death. Dan is called "Doctor Sleep" because of it. 

In his childhood Danny had a imaginary friend Tony. Now Tonny is a link between Dan and Abra, a little girl who also has some "shining" abilities.