According to Merriam and Webster a sleeper can be someone or something unpromising or unnoticed that suddenly attains prominence or value. On that note I would have to say that today's storm is indeed that, a sleeper.
According to the weather people in the know this storm was supposed to be over a noon. Well at noon instead of leaving it kicked in with a vengeance. There was suppose to be little or no accumulation. The 3 or 4 inches covering my backyard are a bit more that little or no. And it is still snowing, and has been all day.
Sleeper... I wonder what tomorrow's weather will bring.