Roughly two months after checking himself into Detroit's Brighton Hospital for an addiction to sleep medication, Eminem has been released and is ready to hit the studio.

Sources say Slim Shady spent three weeks in the rehabilitation center and spent an additional three weeks in the hospital's outpatient program, completing his treatment in late September. Em opted to go the rehab after six weeks on the Anger Management 3 tour.

Word is the rapper constantly struggled to sleep, causing him to cancel the European leg of the tour. Interscope Records officials initially said that exhaustion and other medical issues were the cause of the tour's cancellation. A label spokesperson wouldn't comment.

Em is already back in the studio collaborating with Dr. Dre on two new songs for his forthcoming greatest hits album, Curtain Call. Dre reportedly flew into Detroit to work with Slim this past weekend.

Prior to Curtain Call's announcement, rumors had been spreading that Em was to release a three-disc compilation dubbed The Funeral. The CD was to feature Em associates putting an end to each of the Detroit lyricist's musical personas.

Eminem's Curtain Call is scheduled to hit stores December.

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