Interesting movie but the parents lack of thinking annoyed me [SPOILERS]
SPOILERS!!!
Maybe I'm watching too many movies but I tend to get annoyed if the protagonists are absolutely clueless and act in a predictably stupid way. The parents didn't stop to think for one second! Here are the things I almost immediately thought about of trying and what the movie unfortunately didn't explore:
1. Sleep with him in the same room / bed and wake him if it gets spooky
2. Give him a drug that suppresses dreams (wouldn't have worked of course)
3. Tell him that the cankerman has a weakness: He will flee as soon as you sing the Hickory Dickory song!
4. Tell him that it's just his imagination and that he can control it
5. Train him in techniques for lucid dreaming
6. Give him a wristband that buzzes to wake him and can be remote controlled
7. Measure the area of effect of his dreams - move to an isolated cabin with lots of uninhabited space around it.
They should have immediately talk with Cody about what was happening when they first realized it, and should have make a plan for how to deal with it. If they had talked with him they would have quickly discovered about his boogeyman and could have easily avoided the problems. They were very weak and stupid people, making them negligent or reckless parents. Honestly, no wonder their first son died.
The movie even mentioned lucid dreaming, so the most sensible thing would have been to read books about it and immediately start to train him in that. There are techniques on how to train yourself to remember dreams (dream journal) and how to achieve lucid state while dreaming (e.g. if you see the cankerman you'll know you are dreaming, and you can influence your dream).
I'd be curious why they didn't try a drug that lets you sleep and rest but actively suppresses dreams. If such a drug exists. And if that is healthy or not. But it sure might have been a stop gap solution to the problem.
At least they could have slept in the same room / bed as the kid as a safety measure, so they can wake him up when things get spooky. It wasn't even needed for the mother to give the kid sleeping pills, all she had to do is take away his coffee and tell him to go to sleep - and tell him she'll wake him if something bad happens.
And if they had stopped to just think about it for a moment, they could have started to learn more about it. Like measure the area of effect of his dreams. And move to an isolated cabin with lots of uninhabited space around it, and maybe sleep in a separate cabin like a mile away from where the kid is sleeping - with walkie talkies to make sure he's ok. At least then the kid can sleep without worry of hurting someone and grow up until he can control it.
I would have loved to see how that story plays out!
PS: And yeah I realize the writer didn't want the movie to be about that - but it still strikes me as annoying writing.