I believe Erikson called this Identity confusion
If you are the type of person to think really hard about different things throughout the day, you can carry your thoughts to a dream later in the night. It happens to me all the time. Or if you are just a really creative person your imagination could make you have dreams frequently.
The correct answer is any substance or environmental factor other than a steroid
The independent variable is the factor or behavior that is manipulated by the experimenter in order to observe the effect of that manipulation on another factor or behavior that is the dependent variable. To you It is also called the experimental or active variable.