I can't sit in the half-darkness.
I can't see in the half-darkness. Other things
can see in the half-darkness.
I prefer a deep, black darkness that hides me from all but the supernatural, that keeps me unaware until the death is upon me.
On a practical note, this makes going to bed a real pain. I have to be in a position to close my eyes almost immediately after the lights are turned off. It also limits my enjoyment of nighttime sex; I like being able to see just that much.