Fairly sure that my memory is correct in recalling a similar incident in a night freight MU2 bound for Cairns who woke up somewhere, let's say well north of Cairns. Approaching Lockhart River if memory serves me well, which led to a certain concern over fuel reserves.
Not sure about that one, but something much the same happened to an MU-2 Sydney - Melbourne.
The poor bloke woke up, looked down and didn't see any lights below him. Not suprising, as he was over Bass Straight.