The Japanese Nikkei 225 index had fallen by 1.2 percent at the lunch closing, and the broader Topix index had fallen back by 1.7 percent.
Shanghai, Shenzhen and Hang Seng have been closed during the day on Wednesday.
While waiting for large parts of the US state apparatus to potentially be shut down in the morning, Swedish time, the Japanese stock exchanges are falling.
The Japanese Nikkei 225 index had fallen by 1.2 percent at the lunch closing, and the broader Topix index had fallen back by 1.7 percent.
Shanghai, Shenzhen and Hang Seng have been closed during the day on Wednesday.