HAVE WE ALL BEEN SLEEPING on Carrie Mae Weems? The question might sound counterintuitive, considering the esteem with which the artist has been held since her emergence in the 1980s if not altogether off the mark, given the successes she has enjoyed in the past year. Highlights include a MacArthur “genius” award, a magisterial display of her “Museum” series at the Studio Museum in Harlem, and the star-studded “Past Tense/Future Perfect” conference organized around her work at the Solomon R. Guggenheim Museum in New York, the last stop of “Carrie Mae Weems: Three Decades of Photography and Video,”