直接引语变间接引语中的lastnight怎么变

直接引语变间接引语中的last night要改为the night before，例如： He said， "I had a good dream last night." --- He said that he had had a good dream the night before. 如果直接引语和间接引语都是在同一天说的，last night不改，时态也可不该。例如： He said he had a good dream last night.