"I could die a thousand times, and yet upon waking, again becomes the monotonous reverie."
(Of course maybe I'm really just talking about work again)
Life in a colorless realm can get to the best of them, though it just makes their hunger even more insatiable. Shadow creatures don't die, they just flicker out for awhile- they'll come back in more haste if summoned, due to the additional energy being invested in them.