If the behavior concerns you it should be evaluated by a medical professional. There could be several underlying causes.
It is a symptom of autism, though having only one symptom does not mean you have the disease. Try looking up autism to see if any other symptoms apply. It can mean your stressed or tense. I know individuals that do this, and the best thing to do is relax. This increases tension build up is not good for your health, and can decrease you life expectancy.
No, hallucinations are a positive symptom. The difference between a negative and positive symptom is that a negative symptom means that something usually present in normal people (affect, social interaction) is missing, while a positive symptom means that something is present in the person that is not present in normal people (hallucinations, delusional thinking).
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