I think you should keep taking your risperdal, and try your best to sleep. Do you have something you can take for insomnia? If these perceptual abnormalities/hallucinations persist, I'd make an appt with your pdoc. You may need to up the risperdal...adding something for anxiety might help too. When I'm in a state like that, I find that the worst part isn't the hallucinations, it is the anxiety I have over the possibility of losing my mind completely.

Also, you said that you're not manic because you're not elated or giddy, but mania (unfortunately) isn't always sunshine and rainbows euphoric. Sometimes it is storm clouds and tornados dysphoric. Do you feel more irritable than usual? Rageful? Annoyed? On edge? Have racing thoughts?