Yes Ken, it must have dropped to -4 or so. When I realised that I had only 30 min or so until M31 rose, I sat in my comfy chair and looked at the stars - pretty tired by then - not noticing the cold, particularly. Glad I woke up again after 10-15 min. Would I have been the first amateur to be found dead inside an ice-block?? I also suspect that is not funny and is a risk - falling asleep in sub-zero temperatures, even if fairly well wrapped up.
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