Psychosis
If you have a psychosis, you are out of touch with reality. You may suffer from delusions. These are thoughts about a situation that are incorrect. For example that the FBI is following you, or that you are a messenger from god. You may also suffer from hallucinations. For example, you hear voices that are not there.
If you are sensitive to psychosis, alcohol can trigger a psychotic episode. If you drink alcohol, you become less stable. And the quality of your sleep decreases. This can cause you to become psychotic.
If you are prone to psychoses, it is better not to drink alcohol.