I remembered reading this a while back and thought it might intrest you. Search for symptoms of narcolepsy and see if you're experiencing any of the other symptoms. The hallucinations doesn't necessarily mean you have narcolepsy, but it is a symptom. It probably would be a good idea to get tested. If you don't have narcolepsy, the doctor may know of a treatment for the hallucinations. Here's the info I had seen:

hypnagogic or hypnopompic hallucinations are visual, tactile, auditory, or other sensory events, usually brief but occasionally prolonged, that occur at the transition from wakefulness to sleep (hypnagogic) or from sleep to wakefulness (hypnopompic). The affected individual may hear sounds that aren't there and/or see illusions. These visual and auditory illusions are very vivid and may be bizarre or disturbing to the victims.

People report being fully awake and aware but completely paralyzed. Sometimes they see a strange light. Most often there is pervasive fear, sometimes so strong that people are sure they are about to die. Other parts of their hallucination, which may include people, animals, parts of objects, or just shapes, have a mysteriously nightmarish quality.

The hallucinations are quite vivid and specific. People visualize intruders in their bedroom; they see someone coming through the window, they hear footsteps getting closer and closer and they fear they would be murdered in their bed. Some victims see frightening stranger walk in and out of their bedroom.

This phenomenon also can occur in individuals who do not suffer from narcolepsy, particularly in children.

The hallucinations that I experience aren't very scary, they are if you thought you saw someone but you know it really isn't there. I'm not paralyzed either. I really get out of bed with my eyes open and walk towards the item. Its very faint, not vivid. My wife catches me most of the time and I wake up (although my eyes are already open, I just realize that the object isn't there). Most of the time I reason through the halluncination as I sit up in bed. I reason that the object really isn't there and convince myself to lay back down. It's like i'm sleep walking with my eyes open and I used logic to wake myself up. Its strange because it doesn't bother me at all. I think I have the hallucinations when i'm overly tired or stresses.

I'm not sure what else it could be. Since it started just a couple of years ago, it could be a chemical imbalance. But one thing is sure, something has changed and it definitely could be more stress. Stress can do strange things to the body. All the same, I would at least get a physical and blood profile (if you haven't done so already) and mention the hallucinations to your doctor. Everyone doesn't always react the same to certain conditions. For example, some people that have stress may experience an upset stomach and that's it. Others may have anxiety attacks. Back in 1995, I thought I had an allergy or something because every time I went to a place that involved me sitting down for a while, my nose would run, I would have an upset stomach, and my arms would go numb. It was very disruptive and I just dealt with it the best I could. I finally mentioned it to my doctor and he said that it sounds like a panic attack. For the 27 years before 1995, I didn't panic about such things - it was quite the opposite. I wasn't bashful about anything. It was just a chemical imbalance. Now, i'm back to my old self, making my wife blush and laugh again wherever we go. The bottom line...I misdiagnosed myself.

The thing I found out during my research is that the brain can do strange things (check out my post "i see skittles"). I can close my eyes right now and see that stuff swirling around. My problem really isn't sleep related but it does affect my sleep. The best answer I have gotten is that it's an overactive visual cortex and is most likely benign since i've had it all my life. You would thing that there was someone out there experiencing the same thing but I haven't found anyone yet. Maybe they think that it's normal, just as I did until I started asking people.

Best of luck finding out what it is and remember that it doesn't hurt to ask.