This is a control group. Then have both groups see whether they recall a dream the next morning. You can make up a series of simple pictures, show them to people, and have them draw the pictures from memory. Then give them a list of words, which they would write down from memory. Think of ways to test these theories.
Some people are able to influence their dreams in various ways.
Some know they are dreaming while they are dreaming, which is called lucid dreaming. Still others change their dreams while the dream is going on, even without actually knowing that they are dreaming. Do a survey to find out how many people can do each of these things and how frequently they are aware of doing it. Look at people's dreams after they have been given an instruction to dream about a specific topic. Tell them to spend several minutes thinking about theinstruction just before sleep.