This is a big one, guys!  Insomnia was the first novel that Stephen King had published after I had become a Stephen King fan.  Nightmares and Dreamscapes might have been the first short story collection, but this is the first, full-blown novel that I had to look forward to, and I honestly think that Stephen King wrote it specifically for me.  Why? 
1) It takes place in Derry, the city of his 1986 masterpiece, IT. 2) It's a wild, comic-booky concept involving colorful auras, super powers, and higher levels of existence.3) It introduces 2 classic Stephen King villains, the rusty blade wielding Atropos and his master, the grand daddy of all Stephen King baddies, the Crimson King, which brings me to . . .4) He fleshes out the mythology of the Dark Tower series in ways that he hadn't done so in the actual Dark Tower books.  
Some people hate this novel, and this episode is designed to convince them that they should give Insomnia another chance!