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According to documents filed in Federal Court last month, attorneys on both sides have repeatedly asked the court to extend the deadlines for trial, because the 43-year-old is unable to help prepare his own defense.

The next hearing is on Feb. 18, and the judge has said that there will be no more extensions in the case.

Feds are noting that there has been no discernible progress with Coleman’s mental health in the past several months.

Coleman has repeatedly tried to mutilate himself in federal lockup — cutting himself with a razor, diving headfirst into a toilet, punching himself in the face and repeatedly slamming his head against the floor, according to court records.

Coleman, who allegedly slaughtered Kaleo, 2, and Roxy, 10 months, in 2021 because he believed they had serpent DNA, is now under constant observation — and authorities have started medicating him against his will, according to court records.

He has been medicated since May.

The Post has learned that Coleman has limited contact with his family — and when they talk, the former surf instructor is nearly incomprehensible.

“He rambles a lot,” said a Coleman family member.

“And it doesn’t make a lot of sense. Something has happened, but he’s not the man we know and love. I don’t know what switched.”

On Aug. 7, 2021, Coleman was packing for a family trip with his wife Abby, when authorities say he abruptly and wordlessly put the two kids into his van and drove away.

Coleman took his kids over the border into Mexico and stayed at a resort hotel for two days.

Then, investigators say, he drove his kids to a nearby farm, where he stabbed them both with a spearfishing gun.

A farmer made the grim discovery within an hour of the killings.

Coleman was arrested as he attempted to re-enter the US.

He has been charged with two counts of murdering US nationals on foreign soil.

When Coleman was arrested, he allegedly told the feds he killed his kids because he had been convinced by the QAnon conspiracy theory that they possessed serpent DNA and needed to be killed to protect the human race, according to a 30-page search warrant application released at the time.

Sometimes rambling incoherently, Coleman allegedly told FBI agents that he was “seeing all the pieces being decoded like ‘The Matrix,’ and that he was Neo,” the movie’s main character.

“He said visions and signs revealed his wife, A.C. [Abby Coleman], possessed serpent DNA ([He] mentioned that he was not sure if his wife was a shapeshifter) and had passed it onto his children and that all things were pointing to the idea that his children have corrupted DNA that will spread if something is not done about it,” reads the affidavit.

After Coleman’s arrest, his wife, Abby, left California and returned to her home state of Texas, where she currently lives, surrounded by her family.

She has not yet filed for divorce, but the family source tells The Post that she is trying to pick up the pieces of her life.

“Obviously what she had is now gone forever, and she’s been dealing with that for more than three years,” says the source.

“But she’ll never be the same. It’s still very sad.”

A court-appointed attorney for Coleman did not respond to a request for comment.