The difference between hallucinations and dreams and fantasies is that hallucinations are a type of abnormality and the result of external manipulation. For example, drug use can affect our perception of reality, imagination and our normal dreams and create a kind of manipulation.

But you may dream that you are hallucinating and you are aware of this. That is, without having taken drugs or medication, you feel in your dream that your perception is being manipulated and you cannot see reality easily.
This dream can be an image of the manipulation of truth in the real world, meaning that you are in a period where it is difficult to see some truths. This dream can occur in times when you have received your information from unreliable people whom you do not trust or in situations where it can be felt that the truth is being manipulated and the data presented to you does not fit your logic.Such a dream warns you about getting involved in wrong and illogical information and asks you not to let your mind be influenced by such information and not to do anything under its influence.

But if you saw in a dream that you yourself caused the illusion, for example, by taking a certain drug or medicine, this dream is a picture of negligence on your part that has caused you to not see the truth. Sometimes, a lot of sadness and confused thoughts can appear in the form of a dream about drugs and illusions. These dreams ask you to be more careful about your mental health and control the flow of your thoughts