PT6ER, reminds me of a tale in Flying about US Doctor who breathed in unhealthy amounts of CO2 in his PA-24 one night and passed out... the aircraft on autopilot and well trimmed overshot its destination and ran out of fuel...
The Good Doctor came to with a stonking headache and found himself sitting in the aircraft which had made a perfect wheels up landing in a snow covered field. So far as I can remember damage was light and the aircraft flew again.