A、They might actually cause more serious sleeping problems. B、They help produce a substance that induces sleep. C、You must not d

W: Mr. Kim. Lots of people are suffering from being unable to sleep, including me.
    M: Well, you must be feeling bad, twisting around, and trying to find a comfortable position. But you’re probably only making matters worse.
    W: Really. I thought changing positions would help.
    M: That’s not right. What happens is that your heart rate actually increases, making it more difficult to relax. You may also have some bad habits that contribute to the problem.
    W: Really? Like what?
    M: Do you rest frequently during the day? Do you get virtually no exercise, or do you exercise too much late in the day? Do you sleep a lot or sleep late on weekends?
    W: You’re talking about me! I’m leading a life like that. I guess lots of people do like this.
    M: Haha! Any of these facts might be leading to your insomnia by disrupting your body’s natural rhythm.
    W: What should we do then on those sleepless nights? Should we take some sleeping pills?
    M: Don’t bother with sleeping pills; they can actually cause worse insomnia later.
    W: I thought sleeping pills would help. What’re your suggestions for our audiences?
    M: The best thing to do is to drink milk or eat cheese or tuna fish. They are all rich in amino acid that helps produce a substance in the brain that induces sleep. This substance will help you relax. And you’ll be on the way to get a good night’s sleep.
    W: I’m so excited to hear all this. I guess many of us will change our way of life since they have listened to our talk.
    M: Your sleeping will become better and better if you insist.
    W: I’m sure I will! Thank you much for your advice and thanks for joining us this evening!
    M: It’s my pleasure.
    Questions 1 to 4 are based on the conversation you have just heard.
    1. According to the man, what happens when you turn and twist to get comfortable?
    2. According to the man, what sometimes causes people to have trouble sleeping?
    3. What does the man say about sleeping pills?
    4. Where is the talk most probably happen?