 Shares of Sleep Number Corp. SNBR, 3.36 fell more than 14 in the extended session Wednesday after the mattress and bedding manufacturer missed fourth-quarter expectations and said the late arrival of semiconductor parts from an undisclosed large supplier in December caused it to miss out on millions of dollars worth of sales. Sleep Number said it earned 11.1 million, or 47 cents a share, in the quarter, compared to 2.19 a share in the year-ago period. 