I woke up last night, and there was no wind or sound at all. Whilst trying to get back to sleep, I heard a faint and somewhat strange noise. I moved my head, and the sound disappeared. That is when I understood it was the sound of the slow leak of air from the inflatable sleeping mattress.
Managed to cover a fair distance today. It has been hilly, but the Great Wall is in good shape here, so I spent a long time walking on top of it, and not beside it.
Close to the end of the day there was a long and steep descent. I ended up camping by a beautiful watchtower that has been restored. Behind it, there is a small fortified area, and a large archway to the valley to the south.
20 kilometres today