A、Experimental medicines. B、Special treatment centers. C、Innovative physical exercises. D、Flexible work schedules. B

M: I’m so tired that I can’t see straight.
W: You’ve been tired a lot lately, haven’t you?
M: Well, for the last few weeks, I’ve had to stay up most the nights 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 six a.m., and that’s the time I usually get up.
W: Your biological rhythms probably haven’t adjusted to your new schedule. I’ve read 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 me several special treatment centers for sleep disorders across the country. Some people sleep too little, scale too much, sonic sleepwalk in their sleep.
W: I’d like to find out how they treat problems like that. Maybe you should go to one of these 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.