Nameless Claw

Power down when I'm not around so I can relax/ I can't let my guard down/ What if you go changing on me?/ You're my wallpaper, so still/ Absorbing shadows, reflecting light/ All night you watch/ All day you wait/ And still, so unsettled/ I find no rest unless I'm alone in pitch black where figments pull me back/ Deeper within you/ But the coming back gets harder/ I run away and run away/ Still I'm not surprised when you become the chasing moon and stay in my window 'til long past noon/ Now I know I'll never thaw out/ So what do I call this nameless claw that's ripping through my chest?