How about
"I don't like feeling like someone is trying to make me feel guilty for needing and wanting some private time. I've explained before that I nap in the afternoons. When I do that, I don't answer my phone and my front door is closed. I feel that I've explained that to you sufficiently in the past."
OUCH! That still sounds harsh...
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.