Troubled by bouts of sleepwalking and disturbing nightmares, graduate student Sarah Foster goes to her university sleep research center for help. But when she wakes up after her first night of being monitored, the world she lives in seems to have changed in subtle, Twilight-Zone-esque ways.游戏是一个第一人称的画面，在视线之中是一条幽深的道路，透过这第一人称的视角可以看见这个手机游戏里的主角正在快速的往前奔跑着，但是在旁边却有一个危险的提示信息，上面显示着：周围危险。