Have you asked why he isn't able to sleep? Is it because of his hallucinations or paranoia?
It could be the case that they are lessened when you are around him.
Speaking from experience, my voices are always quieter when I am around my parents.
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The Wheel of Time turns, and Ages come and pass, leaving memories that become legend. Legend fades to myth, and even myth is long forgotten when the Age that gave it birth comes again...
"To travel hopefully is a better thing than to arrive." Robert Louis Stevenson 
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