Metta World Peace was roused out of bed early this morning when police responded to a report of 4 armed men in the basketball star's condo complex ... TMZ has learned.

Law enforcement sources tell us LAPD got a call around midnight about 4 guys -- 3 with handguns and one with a shotgun -- lurking around the L.A. Laker's westside home.

We're told officers called out the suspects over a loudspeaker, and 2 men -- Metta's brother and cousin -- heard the commotion and came out to talk to cops.

Only problem is ... we're told they didn't have any ID, so police handcuffed both men until they could make sure they weren't suspects.

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