At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
We could write an entire term paper, if we wanted to give every reason for why people have hallucinations. Hallucinations can happen for many reasons. Mental disorders (like schizophrenia), neurological disorders (like Parkinson's disease), drugs, fatigue, migraines, etc. Some hallucinations are actually normal. That's something not everyone knows. There's a certain kind of hallucination called a "hypnagogic" hallucination. When these hallucinations happen, they tend to happen right before we fall asleep, as we're starting to get drowsy. We might start start seeing images, or hearing voices. Many people actually experience hypnagogic hallucinations. Sigmund Freud explained the reason for why hallucinations happen with unconscious thoughts and desires. Wishes that we aren't consciously aware of. And other scientists believe that there are two neurotransmitters that play an important role in hallucinations: dopamine, and glutamate. As for exactly how they play a role, I've got no idea. Do you know anything about hallucinations?