在一次药物试验出现严重失误后，幸存的测试对象必须战胜睡意，并相互对抗，才能活下去。

　　A successful single mother's carefree sister reappears out of the blue one day to stay with her and her teenage daughter.

　　A successful single mother's carefree sister reappears out of the blue one day to stay with her and her teenage daughter.

A successful single mother's carefree sister reappears out of the blue one day to stay with her and her teenage daughter.