It is difficult to determine why you are having night hallucinations. Hallucinations can be an indicator of a psychotic disorder. Psychotic disorders include schizophrenia, schizoaffective disorder, psychosis disorder not otherwise specified, and several others. Though hallucinations are associated with psychotic disorders, it is an unlikely possibility in your case. The main reason is because your hallucinations only occur at night. In addition, there was no mention of other symptoms that are indicative of a psychotic disorder.
A second possibility is that you have an undiagnosed medical condition.
The third and most likely possibility is that you may have a sleep disorder. Some sleep disorders have symptoms that are similar to those that you have described. To determine whether you have or don’t have a sleep disorder would require a sleep study. Your primary care physician can refer you to a sleep disorder clinic.
Even if your doctor did not take you seriously the first time you discussed your symptoms, you should attempt to discuss them again. Be persistent and be adamant about your desire for help. Being persistent will likely motivate your doctor to help. If your doctor continues to ignore your concerns, then see a different doctor.
In addition, it is important that your parents know about your symptoms. If your parents spoke to your doctor, the doctor would likely take your concerns more seriously.
It is important to evaluate the problem and then to find the right treatment. That process begins with speaking to your parents and again with your doctor. Please take care.