Shares of mattress makers took a dive Wednesday, after Wedbush analyst Seth Basham said he has seen signs suggesting Memorial Day sales came up short. That "negative" sales weekend came despite what Basham said in a pre-weekend note were signs of "incremental promotional intensity" and "outsized discounting" to goose sales. Shares of Tempur Sealy International Inc. /zigman2/quotes/207239091/composite TPX +3.24% sank 6.3% in morning trading, Purple Innovation Inc. /zigman2/quotes/200268252/composite PRPL +10.47% slid 5.6% and Sleep Number Corp. /zigman2/quotes/203019104/composite SNBR +6.83% dropped 5.9%. The selloff compares with the S&P 500's /zigman2/quotes/210599714/realtime SPX -0.12% 0.6% decline. "Our Memorial Day weekend mattress sales checks with retailers and industry contacts leaned negative, with total bricks-and-mortar sales flat-to-down [last-seven-days, year-over-year], and implying industry unit sales down mid-single- to high-single digits for the holiday period," Basham wrote in a note to clients. Basham said there's evidence that sales for mattresses priced below $1,000 saw larger sales declines, while premium and luxury priced mattresses fared better but saw "waning" demand.