eight o'clock
`` I should strongly advise you to sleep if you can to-night , Mr. West , in preference to listening to the finest tunes in the world , '' the doctor said , after explaining these points . `` In the trying experience you are just now passing through , sleep is a nerve tonic for which there is no substitute . '' Mindful of what had happened to me that very morning , I promised to heed his counsel . `` Very well , '' he said , `` then I will set the telephone at eight o'clock . '' `` What do you mean ? '' I asked . He explained that , by a clock-work combination , a person could arrange to be awakened at any hour by the music .