Teacher: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Answer: whether mood affects their learning ability
Solution: Researchers did experiments on kids in order to find out _ .
Reason: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Now, solve this instance: Article: Insomnia is the inability to fall asleep or sleep restfully.It is a problem to nearly everyone at some time .A person may be awake for an hour in the middle of the night and then , next morning, feel that he hardly sleep all night Normally, worry about not getting enough sleep is the worst aspect of most insomnia.If insomnia is recurrent, however, it is important to find its causes and try to correct them, with the help of a doctor if necessary. Any of a large number of simple factors may take it difficult for someone to fall asleep or remain asleep.His matters may be too soft or too hard.If there are too many blankets on a hot night, he may be too warm; if the bedclothes are too light he may feel cold during the night.If it is not dark enough, or too noisy, this may cause difficulty in sleeping.Eating shortly before going to bed also be responsible for insomnia.Stimulating drinks, such as tea or coffee, can also keep people awake. Inability to fall asleep is sometimes a symptom of emotional or mental disorders.Insomnia may also be caused by pain and, very rarely, it can be a symptom of a physical disease. The cause of insomnia may be easy to correct.The sufferer should check the mattress, bedclothes and bedroom temperature, and make any necessary changes.An eye mask keeps out the night and ear-plugs shut out sound.He should relax for an hour or two before bedtime, perhaps by reading a book; watching TV, or taking a warm bath.If he wakes during the night he should try turning on the light and reading for a while.Taking warm milk and a biscuit or two may be helpful.Above all, he should try not to worry about sleeplessness when someone is tired enough he nearly always falls asleep. If necessary, a doctor may prescribe tranquillizers or sleeping pills.Take only the dosage he prescribes; any more is dangerous.
Answer: a modern disease
Student:
According to the writer, insomnia is _ .