midnight
In obedience to a weird impulse she always opened a window in the Tower room every night before going to bed . She had left it open to-night . It was still open when she entered the room herself . There was nothing unusual in the aspect of the place but that Robin was there and it was just midnight . She was not walking in her sleep . She was awake and standing by the table with the pamphlet in her hand . `` I could n't go to sleep , '' she said .