The estranged wife of accused Gilgo Beach serial killer Rex Heuermann said her two children “cry themselves to sleep” following his shocking arrest — that’s left their Long Island home a complete wreck inside.

In an exclusive interview with The Post Monday, Asa Ellerup, 59, said she’s been riddled with anxiety after investigators spent 12 days ripping up her Massapequa Park home in their search for evidence in the alleged slayings.

The damage is so bad, she said, she doesn’t even have a bed to sleep in.

“I woke up in the middle of the night, shivering,” a still-shocked Ellerup said. “Anxiety.

“My children cry themselves to sleep. I mean, they’re not children. They’re grown adults but they’re my children, and my son has developmental disabilities and he cried himself to sleep,” she continued about the emotional toll the stunning case has had on her kids.

Her daughter, Victoria Heuermann, meanwhile, has expressed feeling “not human” in wake of the mess left behind.

Asked what she meant, Ellerup’s lawyer, Bob Macedonio, chimed in, “She meant what they’ve done to them and the family is not even human. They were just complete animals. They treated them like animals.”

Ellerup said that even though the house seems unlivable, “It’s the only thing I got.

“We did get another chair out from the basement and upstairs so me and my son can sit and talk. He’s so distraught and doesn’t understand, and as a mother, I have no answers for him.

“But I said, ‘We’re together,'” Ellerup said. “‘That’s really what matters right now. That you and me are sitting here together and we will get through this.'”

Ellerup, her special-needs son, Christopher Sheridan, 33, and her 26-year-old daughter, Victoria Heuermann, were suddenly forced out of their ranch-style home after the hulking architect was arrested and charged July 13 with three grisly cold-case killings.

Rex Heuermann, 59, faces three counts of murder in the deaths of three women, Amber Lynn Costello, 27, Melissa Barthelemy, 24, and Megan Waterman, 22, whose bodies were found on Gilgo Beach in 2010. He is the prime suspect in a fourth killing of Maureen Brainard-Barnes, 25 — with the victims known collectively as the “Gilgo Four.”

Macedonio said Monday Ellerup was “blindsided” by her husband’s arrest. She has since filed for divorce.

“She was in complete shock. Completely caught by surprise,” the lawyer said.

Suffolk County and state police spent nearly two weeks combing through the Heuermann home, even digging up the backyard in a search for body parts or “trophies” from the slayings.

Last week, cops packed up and left, with Ellerup and her children returning home for the first time.

Images from inside the home obtained exclusively by The Post show a disheveled nightmare, with boxes strewn about and piled up high. One photo shows a piece of the bathtub cut out and a chunk of the tile on the floor missing.

“[The police] walked up, they went into the vehicles and out the door they went,” Ellerup said. “Out. They left. And when I got into the house I might have had a few steps of walking space between my front door and the kitchen.

“I had three cats. Litter boxes were a strew, thrown on top of everything. My pictures were thrown all over the place,” Ellerup continued. “My couch was completely shredded. I don’t even know if there’s any parts to the couch.

“There was a Pelican case in my house which had clothes in it, and inside of a Pelican case they have foam. I was able to take two pieces of foam and I was able to take two pieces of foam and put it together so I could lay down,” she said. “My backyard, I can’t even explain it.

“I had a greenhouse and I like planting seeds and my greenhouse, they it, they lifted it up. They stuck it, it’s high. You know, they threw it on top of a whole bunch of stuff. It’s a $3,000 greenhouse.”

Cops even changed the locks on the house so they were forced to get new keys, Macedonio claimed.

Ellerup said investigators even trounced on Victoria Heuermann’s Dungeons & Dragons Magic cards, some of which are quite valuable, and broke her son’s guitar.

Macedonio said the family is still trying to take stock of the damage.

“We just got back from the residence,” he said Monday. “We’re making an itemized list of all things. Since she just returned home we don’t know the extent of the damage or what’s missing.

“We’ll be in touch with the DA’s office.”

Rex Heuermann, meanwhile, is due back in court Tuesday for what’s expected to be a brief hearing.

The accused killer pleaded not guilty on July 14 — and has yet to receive a single visit in jail from his family, authorities said.