There's a lot going on that may prevent sleeping tight. 
 Sleep Tight has many a thriller/horror trope, and it's a rather varied read.
 Behold:
 - serial killer known as Father Silence, on death row.
 - a copycat/follow-up killer many years later.
 - Father Silence's only surviving victim speaks from a mental hospital.
 - religion and cults.
 - eyeballs as a signature.
 - query DID diagnosis.
 - kidnapped children and murdered parents.
 - cheating psychologist husband and addict detective spouse.
 - unreliable characters with hidden memories. 

It's kind of all here! It's quite a cinematic read with the aforementioned items going on.
 Not a standout for me in the genre, but a solid read.