four o'clock
He could not make it out . Over and over he turned the matter in his mind . Hours passed and he began to think it must be time for another day to come . At four o'clock he pulled the covers up about his neck and tried to sleep . When he became drowsy and closed his eyes , he raised a hand and with it groped about in the darkness . `` I have missed something . I have missed something Kate Swift was trying to tell me , '' he muttered sleepily .