“Coitus and sleep—both relieving the discontinuity of spinal-priapic erection through collapse into horizontal submersion—represent attempts at ‘archaic’ regressions. During both, ‘the whole body assumes [a] spheroid shape’, recapitulating not just conditions in utero, but the morphologies of our pre-bilateral ancestors, the marine radiate. Ferenczi states, moreover, that the sleeper’s executive center, their ‘soul’, sinks back through nervous laminae, routing down from hibernating and deactivated encephalon into the proprioceptive spinal column. A katabasis of the CNS, sleeping is thus temporary decapitation: the somnolent ‘has only a “spinal soul”’, Ferenczi exclaims; evidence, then, of the sleeper’s ‘phylogenetic regression’ through neuronic layers. The ‘soul’ descends spinally from brain to thorax; a genuine recapitulation of precephalic existences. Dreams are spinal emissions. Sleep is time travel.”