Chronic tosser-and-turner (9)

I believe the answer is:

insomniac

(Other definitions for insomniac that I've seen before include "One who can't sleep" , "This person can't sleep" , "One unable to sleep" , "One lying awake" , "Person finding it difficult to sleep" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.