When I went to east Africa this year it was like 45 degrees out and we were sleeping in tents. But they gave us hot water bottles. It is amazingly effective.
I have never used a hot water bottle in my life, although I do pile several blankets on my feet only during the night to keep them warm.
I figured that one out after the first night. All is well now though, the foot of my bed is finally dry again. Also, regarding the video of the kitties above, that was adorable to watch, thank you for sharing it, dealmaker. I hope the kitty that fell of the tree survived and wasn't hurt.