Can you remember a time when you woke up from a fantastic，scary or strange dream？Were you scared to turn（1）

on

on

the light or was it so good that you wanted to stay in it longer？
   Our dreams come from a part of the brain（頭腦） with our thoughts and memories（回憶）.A person can have up to six dreams a night and each dream usually lasts from 10 to 40 minutes.Everyone dreams，but not everyone（2）

remembers

remembers

their dreams.Most people forget half of their dreams within five minutes of waking up.After ten minutes，90（3）

percent

percent

of their dreams are usually gone.Most people dream in color，usually with a sound.And we usually dream about ourselves and the people we know.
   But （4）

why

why

do we dream？Alan Siegelis，a scientist who studies dreams. "Dreams help us know our deeper feelings，" he says. "They can tell us a lot about ourselves and can help us find our problems." Another scientist，Robert Stick gold，thinks dreams come from our memories.He believes we dream to remember because our memories are useful to the brains.Robert says the purpose（目的） of dreaming is to help us to learn from the past.
   Here are some（5）

types

types

of dreams and what people think they mean.
   Dream1.
   You meet someone in your pajamas（睡衣）：Sometimes people dream that they meet someone while wearing their underwear（內(nèi)衣）!This dream may be the result of an embarrassing（尷尬的） thing in your life.
   Some people think we dream about embarrassing situations（6）

because

because

we are trying our best to deal with（處理） an important thing in our own lives.
   Dream2：
   You are in the air：If you dream about flying，you（7）

may

may

be quite happy.This is a good moment in your life.You may feel you are able to do anything and that other people see you as a leader.
   Dream3：
   You didn't study for a test：This probably means you are（8）

worried

worried

about an important thing coming in your life.If you're not prepared for something，your dream may be telling you "It's time to get to work.".