Mattress Warehouse marks 30 years with Sleepstakes’ By Staff reports October 15, 2013 CHARLESTON, W.Va. -- Mattress Warehouse is celebrating its new location with food, drinks and a dream vacation raffle, Wednesday evening from 5 p.m. to 6:30 p.m. at its newest location in South Charleston's Riverwalk Mall. The company is celebrating 30 years of business with a "Sleepstakes." It will give away a queen-sized mattress set every week for 30 weeks this year. People may register for the event on the company's Facebook page. Mattress Warehouse operates 150 stores in the state. The "Sleepstakes" runs through the week of Nov. 19.