Staff members of Qingdao International Airport check sanitation in a capsule hotel in Qingdao, east China's Shandong Province, May 17, 2016. The capsule hotel, the first of its kind in China, is located at Terminal 2 of Qingdao airport, covering over 400 square meters which offers passengers services including check-in, lodging, checkroom, shopping, library and ect.. (Xinhua/Xie Hao)

Staff members of Qingdao International Airport check sanitation in a capsule hotel in Qingdao, east China's Shandong Province, May 17, 2016. The capsule hotel, the first of its kind in China, is located at Terminal 2 of Qingdao airport, covering over 400 square meters which offers passengers services including check-in, lodging, checkroom, shopping, library and ect.. (Xinhua/Xie Hao)

Staff members of Qingdao International Airport check sanitation in a capsule hotel in Qingdao, east China's Shandong Province, May 17, 2016. The capsule hotel, the first of its kind in China, is located at Terminal 2 of Qingdao airport, covering over 400 square meters which offers passengers services including check-in, lodging, checkroom, shopping, library and ect.. (Xinhua/Xie Hao)

Staff members of Qingdao International Airport check sanitation in a capsule hotel in Qingdao, east China's Shandong Province, May 17, 2016. The capsule hotel, the first of its kind in China, is located at Terminal 2 of Qingdao airport, covering over 400 square meters which offers passengers services including check-in, lodging, checkroom, shopping, library and ect.. (Xinhua/Xie Hao)

Staff members of Qingdao International Airport check sanitation in a capsule hotel in Qingdao, east China's Shandong Province, May 17, 2016. The capsule hotel, the first of its kind in China, is located at Terminal 2 of Qingdao airport, covering over 400 square meters which offers passengers services including check-in, lodging, checkroom, shopping, library and ect.. (Xinhua/Xie Hao)

Staff members of Qingdao International Airport check sanitation in a capsule hotel in Qingdao, east China's Shandong Province, May 17, 2016. The capsule hotel, the first of its kind in China, is located at Terminal 2 of Qingdao airport, covering over 400 square meters which offers passengers services including check-in, lodging, checkroom, shopping, library and ect.. (Xinhua/Xie Hao)