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CEFR 레벨
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Hey, Vsauce. Michael here. And today we are going to talk about why we dream.
What's going on inside our brains?
The scientific study of dreaming is called oneriology.
And for most of history, it didn't really exist,
because you can't hold a dream.
It's difficult to measure a dream, you can't taste it.
You can't see other people's dreams,
and if you ask them to tell you what they dreamt,
the results are almost always unreliable.
In fact, it's estimated that we forget 85 percent
of the dreams we have, especially within the first ten minutes of having them.
But then, in 1952, something amazing happened.
Researchers at the University of Chicago found this.
It's a unique type of electrical activity
that occurs during a certain stage of a person sleeping.
When researchers awoke people during this stage,
they almost always reported that they had been dreaming.
Also, at the same time, during this stage, people's eyeballs are going crazy,
rapidly darting all over the place underneath their eyelids.
You can actually see this happening if you watch people sleep like I usually do.
During REM sleep, some pretty bizarre stuff happens.
If you look at the electrical activity of a brain
that is in REM sleep, it almost exactly mimics
the way the brain acts when it's awake.
The biggest difference being that the production of chemicals inside the brain
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