BBC地平线：生物钟：身体运转的奥秘:在线播放
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BBC地平线：生物钟：身体运转的奥秘:剧情介绍
Plot Summary:An exposition on the workings of the human body clock. A former commando spends 10 days in varying light conditions within an abandoned bunker alone whilst a team monitor the effect of falling out of time sync with the rest of the world on his physical and mental state. Scientific explanations and useful sleeping pattern tips are given throughout the documentary.