In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Let me give you an example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
The answer to this example can be: How many books are there in the British Library?
Here is why: In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

OK. solve this:
Article: Did you know that the position you choose to sleep in says something about what kind of person you are? A study of 1,000British people has been done by Chris,a British professor and director of the Sleep Assessment and Advisory Service in the UK.It looked at the six most common sleeping positions and which personalities tend to match them.Have a look. 1. Fetus position - This is the most common sleeping position. About 41 percent of the _ said they sleep in this position. These sleepers may appear to be strong but they are usually sensitive and shy. The more they curl up, the more worried they are. 2. Log position - This is the second most common position. People who sleep like a log are usually stubborn. 3. Yearner position - This position says that you are open-minded and eager to face challenges. 4. Soldier position - These sleepers lie on their backs with their arms down and close to the body. They are usually reserved and quiet. 5. Freefall position - People who sleep in this position are outgoing but feel a lack of control in their lives. This is the least comfortable position. 6. Starfish position - People who sleep like this are good listeners, helpful, and uncomfortable being the center of attention.
Answer: Sleeping position reflects personality.
Answer:
What is the main idea of this passage?