听力题 M: I''m so tired, I can''t see straight. W: You''ve been tired a lot lately, haven''t you? M: Well, for the last few weeks. I have had to stay up most of the night to observe star configurations for a project in my astronomy class. It''s awful. No matter what time I go to bed, I always wake up at 6:00 a.m. and that''s the time I usually get up. W: Your biological rhythms probably haven''t adjusted to your new schedule. I thought that some people have a lot of trouble when their sleep rhythms are interrupted. Even sleeping pills don''t help them. M: I know. In fact, I''ve heard that there are now several special treatment centers for sleep disorders across the country. Some people sleep too little, some sleep too much, some walk in their sleep. W: I''d like to find out how they treat problems like that. Maybe, you should go to one of those centers. M: Not me. After next week my project will be finished and I''ll go back to my regular hours. Now I know for sure that I don''t want to be an astronomer.