Jesus. That sounds eerily like my experience. Heard scracthes in the attic and thought it was mice. Woke up one morning with a dead wasp in the bed and having been stung. Thought nothing of it. Woke up a few days later with two dead wasps in the bed and having been stung. Huh, that's weird. Then when I woke up one morning I saw a wasp crawl between the planks in the ceiling. Called exterminators and they sprayed the attic. The wasps had built their nest in the isolation and had chewed through it down to the planks... The next week I had hundreds of dead (and a few alive) bees in the room every day and I had to sleep on the sofa..