单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
In the dream laboratory, when are the dreams recorded

A.As soon as the student wakes in the morning.
B.At stated intervals during the night.
C.About five minutes after each dream.
D.Immediately after each dream.