Most scientists agree that sleep is important for our health. The quality of our sleep is just as important as how many hours of good sleep we get. The role of dreaming, _(1)_, is less clear.
When we sleep, our mind cycles through different stages. Dreams mostly _(2)_ in the final stage: rapid eye movement (REM) sleep. Scientists have found that REM sleep is an important part of our sleep cycle. In one study, scientists tried waking up mice during REM sleep. They found that after these mice went back to sleep, they went into “rebound” REM sleep. This seems to try to _(3)_ the time lost when they were woken up.
Other studies show that dreams help us deal with things going on in our daily lives. When something _(4)_ bad happens to us, it can be difficult to control our emotions. Dreaming after such events helps process our emotions and reduces our _(5)_. Others believe that dreams are a sort of practice for real life. Whatever the reasons for dreaming are, we know that it is very important to get enough sleep.
1. (A) for example (B) for the same reason (C) on average (D) on the other hand
2. (A) attend (B) occur (C) enter (D) upload
3. (A) keep up with (B) run out of (C) make up for (D) hang out with
