A New Jersey man slept soundly for about 10 hours until he awoke with a peculiar pain — from a knife in his back.

The 42-year-old Trenton man didn’t know what was wrong until his brother identified the problem.

“His brother said he had a knife blade protruding from his back,” said Lt. Mark Kieffer, a Trenton police spokesman.

The victim, who was not identified, had been stabbed during a fight on his porch, Kieffer said.

The fight started around 2 a.m. Sunday, when the victim, who had been drinking, stepped out for a cigarette.

While he smoked, another man approached and asked for a light. When the victim refused, an argument broke out and escalated into a fight, Kieffer said.

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