If you meant a different "Sleeper Cell" (e.g., a film, documentary, or newer project), please clarify and I’ll look it up.
It looks like you're asking about the scores for something titled "Sleeper Cell" — most likely the 2005–2006 Showtime series about an undercover FBI agent infiltrating a terrorist cell in Los Angeles.
The show won an for Outstanding Miniseries and remains highly regarded, though it was cancelled after two seasons.
