Sleeper processes trades every day at midnight PDT. Depending on the league settings, we'll wait until the proper time period has passed and then run the trade through at midnight PDT.
If you want trades to process immediately, then set time to review trades to none.
For example, if you league settings are 2 days, then we wait for two days to pass before processing the trade at midnight. We recommend 1 or 2 day trade review periods, so the league commissioner has time to review trade.