1. Watch the video and answer the questions.

• How does sleep help us solve problems?
• What does "sleeping on a problem" mean? Does a similar expression exist in your language?
•  How many hours a night did people use to sleep? How many hours a night does an average adult sleep nowadays?
• What two kinds of insomnia does Matt mention?
• What is the principle cause of insomnia? 
• What advice  does Matt give to people who have problems going to sleep? 
• Why doesn't Matt recommend taking sleeping pills? 

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