midnight
When he returned to Piccadilly , he said to the nurse , `` I suppose you can sleep at a moment 's notice ? '' `` Pretty well , sir , '' she answered , with a demure professional smile . `` Then you 'd better find out this room that Mrs. Jenkins has got for you , and lie down for a few hours . I sha 'n' t be leaving until after midnight -- perhaps one or two o'clock . Then , when I go , you can have this sofa here ; and I shall be back early in the morning , to give you another rest . '' `` Thank you , sir . '' He went into the adjoining room .