Contributed by Margaret McCann / “When I Don’t Sleep I Dream” at the Museum of Modern Art traces the odyssey of Afro-Asian Cuban painter Wilfredo Lam (1902–1982). His 20th-century oeuvre encompasses a prescient global combination of influences. Youthful talent afforded him portraiture study in Spain, where he remained for 15 years. But, like Goya, inclination and events pushed his art past appearances.