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.”
Words nearby sleep on something
sleep in,
sleep learning,
sleep like a log,
sleep movement,
sleep off,
sleep on something,
sleep out,
sleep over,
sleep paralysis,
sleep shade,
sleep sofa