sleep on something, to

sleep on something

Consider something overnight before deciding, as in I don't know if I want to go on such a long hike; let me sleep on it. This usage was first recorded in 1519 in the state papers of King Henry VIII: "His Grace ... said that he would sleep and dream upon the matter."
See also: on, sleep, something

sleep on something, to

To postpone a decision until the next day. Both the idea and the expression are very old. The State Papers of HenryVIII (1519) by an unknown compiler stated, “His Grace . . . sayd thatt he wold slepe and drem upon the matter.”
See also: on, sleep