February 8, 2008 -- After a savage, bone- snapping beating, young Yovany Tellez had barely the strength to speak his final words to his mother: "I want to go to sleep." Yesterday, a Manhattan jury convicted Zahira Matos, 23, of Harlem, of murder, potentially dooming her to life in prison. Her drunken lesbian lover had actually dealt the boy's death blows, but the jurors found that Matos had, unimaginably, done nothing for five hours or longer as her moaning 23-month-old son lapsed into a coma and died.