This essay considers the raucous ontology of the feeling body in relation to the expanding field of affect studies. It first shows how psychophysics established an aspirational template for reconciling empiricism and metaphysics—and how contemporary affect theory, which implicitly advances that template, circles the same aporetic bind as psychophysics: that affect, no matter its neurobiological mechanisms, is a metaphysical substance that cannot yield to science. The essay then considers what stories emerge when sentimentality, which thinks feeling in relation to social structures rather than psychological or neurological structures, is taken as a key (Americanist) origin story of affect theory. One such story is “anaesthetics,” or an art of slight living that creatively exploits modes of insentience as a scene of intimacy, not unlike two sleepers sharing a bed. By way of Nella Larsen’s Quicksand and Ottessa Moshfegh’s My Year of Rest and Relaxation, anaesthetics responds to historical crises of obstructed agency by advancing a politics of unlived experience that regards killing rather than reclaiming time, evacuating rather than enriching selfhood, as a means of holding onto the world.