It wasn't an unequivocal success! I had been sleeping in my double bed with the winter duvet on. And that duvet means business! In comparison, the duvet of the single bed is the lightest flutter of taffeta. I had tried to compensate for that by wearing a long-sleeve shirt but it wasn't enough. I was cold! Too cold for a proper night sleep, not cold enough to not be able to sleep and then do something about it. But that only meant I had badly chosen bedding. I tried again the next night with more clothes and an extra blanket! But the listening to the river had been lovely. And I had been scared the room would already be too warm, but that clearly wasn't the case yet. I probably will be in summer, but then I can still go back upstairs!