The man has not been able to ______ recently.

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 am. 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.