Before words. Before thought or language. My guest this week spends his professional life challenged by the reflexes and intricacies of the long-ago brain. By day he is an anaesthetist; an inducer of sleep and guardian of the unconscious. Sometimes that’s more eventful than you’d think. By night he is a poet and a playwright. His latest book fuses night and day in a memoir of his profession. He is Wolf Pascoe and he will be sharing his Undercover Soundtrack here on Wednesday.