sleep on

verb2

1. •
   To postpone (a decision) at least overnight, to avoid making a hasty choice.

   • I like the idea, but let me sleep on it before we go ahead.
   • There's no chance to sleep on the matter. You have to decide now.
2. •
   (slang) To miss or ignore; to underappreciate; to underestimate the quality of something.

   • People are really sleeping on that restaurant down the street.
   • I can't believe I slept on that movie for so long.