I used to get crazy hypnagogic hallucinations when i was younger along with sleep paralysis, freaky as hell when your 10 years old and a demon forms from mist at the foot of your bed and starts "talking" (more like demonic wispers than speach) at you while you are paralised and incapable of achieving any thing louder than a patheic wimper as a desparate cry for help. then on top of that when you mother comes in after about 5 minutes and breaks you out of it she doesnt believe you ( so yea i wouldnt worry too much about voices ;P nothing to cause alarm (unless of course it happens throughout the day)