Mine does exactly the same thing. If she's on the couch watching a movie, she's a goner, but the moment she moves to bed, "it's too loud! Turn it down!" even when it's at 1/10th of the volume when she was drooling on the couch.

I did the same thing with books. I always used to read before I went to sleep. Now, I get tired reading.

It was imperative for an ex girlfriend of mine to have a movie on; or she was unable to sleep. I prefer total darkness so that my body gains the maximum recuperative benefit.