layover - Informal term for a period of delay required by rule. For example, when a bill or other measure is reported from committee, it may be considered on the floor only after it "lies over" for one legislative day and after the written report has been available for two calendar days. Layover periods may be waived by unanimous consent.
Congressional Sessions lists all Congresses and corresponding years - from 1789, when the 1st Congress met, through the current Congress.
You can access legislative information, by bill number or key words, from the THOMAS Web site. Information from the present back to the 93rd Congress (1973) is available on THOMAS.
For information on the Senate, Congress, the legislative process and the federal government, the Virtual Reference Desk is a good place to begin.