Since during the sleep usually there could be no movement when the dreams occur.
Well.... it's pretty difficult to comment for integrated writing task essays because we do not have substantial material on which you have based your writing. However, this is how I generally advise others to tackle this task;
1st Para; Briefly tell what the reading passage suggests. Then tell whether the lecturer asserts or refutes the suggestions of the reading passage. If the lecturer asserts those suggestions, then he supports them with examples. If he refutes he brings up counter arguments. (mention about this fact too).
2nd Para; Pick up the first suggestion of the reading passage. Tell how it is asserted or refuted by the lecturer.
3rd Para; 2nd suggestion + Lecturer's response
You can go on like that .... :)