Can't sleep is a written note found in Death of the Outsider.
Transcript[]
I don't know what else the Outsider did to me, but the dreams changed the day he took my arm and eye away. Maybe he sent those nightmares to start with. I don't know. But now they're all nothing but black, ringing whispers in some language I can't understand. I'll wake up staring at my dead arm, half in this world and half in the Void, the sound still echoing between my ears.
That's still better than the nights when I can't sleep at all. Every shadow, every twitch of movement, every breath and this black eye catches it and keeps me awake. I can't shut it out. And this arm, lying with every move it makes,
Those things aren't a part of me. Are they a part of him? Who would want to see through the Outsider's eyes?
Location[]
This note can be found crumpled on the floor upon waking up aboard the Dreadful Wale during the mission The Bank Job.