He turned the 3 line into his own personal Zzzz train.

This man catches some shut-eye underneath the seats of a 3 train on Saturday — as oblivious straphangers sit right above him as the train rumbles into the 72nd Street station.

Straphangers riding the rails told The Post they were blown away by the scene.

“That’s crazy!” said rider Peter Betta, 62, as he waited for a downtown 3 train at 116th Street. “I’ve never seen anything like that.”

Others said the Big Apple’s homelessness problem is so bad, this IRT scene shouldn’t be considered shocking.

“Homelessness is worse than it’s ever been before,” said native New Yorker Howard Orlick, 56, of Harlem. “There are no rules on the subway anymore.”

An MTA spokesman, asked if the homeless are spilling into the subways, said it’s a city-wide problem.