Gaskings Presents Ricers Vs Sleepers. In this video not only do we explore what a Ricer and a sleeper car is but we show you the key differences between a ricer and a sleeper. So what is a ricer? A ricer is a Race Inspired Cosmetic Enhancement. What is a sleeper? A sleeper is a car that is like a wolf in sheeps clothing. It looks like a normal car from the outside but a sleeper car is packing a punch on the inside.