Rocklin-based Sleep Train announced Friday that it will unify under the Mattress Firm brand, renaming all 318 stores to Mattress Firm.

Sleep Train’s stores will join Mattress Firm’s 3,500 company-operated and franchised stores across the United States.

Mattress Firm, headquartered in Houston, acquired Sleep Train in 2014 in a deal valued at $425 million. At that time, Sleep Train agreed to a takeover by Mattress Firm Holding Corp., a fast-growing chain that has endeavored to build a major presence nationwide.

Back in 2014, Sleep Train founder and CEO Dale Carlsen retained executive status in his company and said, “I’m not going anywhere. I’m a Sacramento boy.” Carlsen retired from his Sleep Train duties in late 2015. He is now the CEO of the Rocklin-based Ticket to Dream Foundation, a nonprofit partner and beneficiary of the Mattress Firm Foster Kids program. Both organizations seek to raise awareness and support for foster children nationwide.