Blue Clay Capital, long-term shareholders of Sleep Number Corporation (NASDAQ:SNBR), have sent a letter to the company's board urging them to immediately elect three Stadium Capital board representatives. They cite poor management decisions, ineffective strategic decisions, and a lack of accountability as reasons for Sleep Number's 46% decline since 2015, compared to a 161% gain for Tempur-Pedic and 125% gain for the S&P 500. They also express concerns about misallocation of capital and resources, untimely stock repurchases, and excessive executive compensation.