A spy, saboteur, or terrorist who lives unobtrusively in a community until activated by a prearranged signal; may be part of a sleeper cell.
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We are up against the pros; and pros who have been involved in this kind of activity for many years. […] The public apathy today is disturbing — few realize, Mr. Chairman, that there are sleepers in this country and we know that they are able to manipulate at will behind the scenes.
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1969, United States Congress, Departments of Treasury and Post Office and Executive Office Appropriations for 1970: Hearings, (91st Congress, First Session, parts 2-3), page 479: