Switching hour is great. Looking up the history of this hour is interesting. It seems back in the middle ages it was very common for people to take two sleeps. They would go to bed at dark or close to it, and awaken for an hour or two likely around this time. It was a time for quiet at home activities for some and for clandestine activities for others. I read about it before when I was walking up every night for a long string of them at the same time.