Sleeper spent 22 years in the merchant marine service shipping out of the port of Boston as a sailor, officer and shipmaster. Sleeper was the publisher and editor of the Exeter, New Hampshire, News-Letter, editor and proprietor of The Lowell Daily Journal and editor and part proprietor of The Boston Mercantile Journal. later The Boston Journal
Sleeper was the editor of The Boston Mercantile Journal, later The Boston Journal from 1834 to 1854. Public Service Sleeper was a contestant for the third congressional district of Massachusetts for the election held on November 4, 1862.