four
o'clock
`` That 's about the size of it ! '' agreed Will . `` So you may as well come back into the house and we 'll go back to bed . '' When the boys entered and closed the door again , it was four o'clock and they decided not to go back to bed again that night . `` How 'd you know there was some one there ? '' Sandy asked of Will . `` I heard the window sash rattle , then a strong perfume -- something like opium or hasheesh -- was forced into the room , then the fellow on the outside began to work his hypnotic spell . ''