 Shares of Tempur Sealy International Inc. TPX, 0.32 sank 3.5 toward a nine-month low in premarket trading Tuesday, after the mattress maker reported fourth-quarter profit that missed expectations, as a cost of sales growth outpaced sales growth to send gross margin lower. Net income rose to 175.8 million, or 88 cents a share, from 144.7 million, or 67 cents a share, but missed the FactSet consensus for earnings per share of 96 cents. 