Hm... I'm not sure...
Could you move the camera down a bit and point it upwards-ish?
It may hide the sinking in the sheet. Also could you move the clock closer to the edge of the... of that? Just an idea...
And the movie was actually an epissode from a TV series called Bedtime Stories or something... the bed was just a coincidence...
The series had stand-alone episodes, each one was a little horror story.. it was nice...
I also saw an episode about a thing in a basement... and I never got over it
I'm still scared of going there.
Anyway...
Just do a quick render and see what you get...
And also try banking the camera the other way...
If not you can leave it leveled so it creates a bit of contrast between the calm of the position and what's in the scene.
Waiting to see what you come up with....