Insomnia has been in my collection for years. I really enjoyed it. I think I have read it three times, maybe four. I especially love the concept of the auras and the little doctors. (It made me wonder what my own aura would look like). The characters are so interesting and I have a soft spot for Ralph and Lois (? Please remind me if I'm misremembering her name).

I read this long before I read the Dark Tower series and was happy to have some blanks filled in later on. If you are a Stephen King fan, this will not be the last that you hear of several characters.

Someone else in the thread recommended Needful Things. It's a great book, too, and quite a ride!