Last night I tuned a piano that kept going out of tune

I'm in a strange concert hall, tuning a piano, but every time I finish a note, the one before it drifts flat again. The customer is just sitting there smiling, and I keep saying 'give me another minute' even though it's been hours. This morning I woke up and my own piano was perfectly in tune from last week. I can't decide if that makes the dream better or worse.