How many employees does Mattress Firm have? Caitlin Bagnall March 21, 2017June 8, 2026 A How many employees does Mattress Firm have? We have more than 6,000 Sleep Experts® who work in our 2,100+ stores across the country and a corporate support team which serves our associates by ensuring they have the tools and resources needed to help our customers get a great night’s sleep.