Insomnia by Stephen King

In Derry, Maine, widower Ralph Roberts begins suffering from severe insomnia after the death of his wife. As his sleeplessness deepens, he starts seeing strange auras around people and mysterious bald figures who seem to exist outside ordinary reality. Ralph soon discovers that his condition has opened his eyes to a hidden cosmic struggle involving destiny, death, and the fate of an innocent child. Blending suspense, horror, and fantasy, Insomnia explores grief, friendship, sacrifice, and the unseen forces shaping our lives.