In her picture book debut, Jeanne Blackmore continues her grandfather Roger Duvoisin's tradition of creating beautiful books for children. Through her poetic and deceptively simple text, Blackmore has created an ideal sleepy time tale: "How does sleep come?" Jacob asked his Mama as he climbed into bed. Jacob's Mama tucked the covers all around Jacob just so, and then she told him. "Sleep comes quietly. Like a snowfall that blankets...