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Warning: Don’t fall asleep around Jeff Lewis.

The 46-year-old is widely known for rehabbing properties on Bravo’s docu-series “Flipping Out” — now in its ninth season — but his best work may be his photo series in which he poses with unsuspecting sleeping travelers in public and posts the comical results to his Instagram account.

But despite his sneaky skills, Lewis’ stealthy approach doesn’t always go undetected.

“It started as a prank to fill time,” Lewis told Page Six. “I spend a lot of time in airports and with all the flight delays, I get bored. Some people read or send emails; I photobomb sleepers.”

“There was a woman asleep on the floor at LAX,” he explained. “I laid down next to her to get a photo, but she woke up and hysterically screamed at me. Sometimes the job can be dangerous.”

But startling subjects is only one of the hazards associated with the prank. The designer now vows to “never fall asleep in public” out of fear of “retribution” from his somnolent victims, and the social media aspect of his photo series has landed him in uncomfortable situations.

But despite the risk of social embarrassment, Lewis has no plans to halt the project, which means you may want to think twice before snoozing outside the privacy of your home.

“Recently I took a picture of someone on a flight who turned out to be my employee’s ex-husband’s business associate,” he said. “That was awkward.”

“Any public event is fair game for me,” he continued. “I’ve taken [the photo] at High Point furniture market, USC football games, airports, train stations. As an artist, I think it’s always important to grow and inspire others with my photography. It’s become my creative outlet and hobby … at others’ expense.”

See more of Jeff Lewis’ photobombs: