According to ent.sina.com.cn, Takeshi Kaneshiro was having a row of nightmares after taking part in the "Wu Xia" autopsy scenes.
Picture source: ent.sina.com.cn
Seemingly, it was because the scenes with the autopsy should have been shot within one day. Those bodies were of the synthetic material but never the less, when the shootings were started on the next day, Takeshi Kaneshiro looked a little dazzled in trance. The reason which was uncovered later was in the fact that Takeshi Kaneshiro had nightmare after the autopsy shootings.
