Kanye West suffered from "severe paranoia" and "hallucinations" due to "lack of sleep" that was linked not only to the rapper's work pressure, but also because of the stress from wife Kim Kardashian’s armed robbery in Paris last month, Entertainment Tonight (ET) reported Monday. According to a source, West's hospitalization was a result of "a mental breakdown" as well as "sleep deprivation and exhaustion."

The 39-year-old rapper was admitted to UCLA Medical Center last week for psychiatric evaluation after he acted "erratically." West currently remains in hospital, TMZ reported, adding that plans of his release Monday had been canceled. West's personal doctor will reportedly take charge of the "Famous" singer's health condition after leaving the hospital.

"He pushed himself too much," a source told ET. "The Paris incident unsettled everyone, [but it] unsettled him the most. He had this anxiety that everyone around him was trying to get him." 

"He had severe paranoia. It was over nothing that was tangible or real," the source added. "He was thinking that people were out to kill him, out to break him and Kim up. It was Kanye vs. the whole world." 

Last month, Kardashian was robbed at gunpoint in the middle of Paris Fashion Week. The five masked thieves reportedly stole up to $11 million in the heist. The reality TV star was unharmed during the robbery.

West's hospitalization came just days after he made headlines for erratic behavior at his latest shows, before abruptly canceling the rest of his "Saint Pablo" tour. 

"This is a person who tried to take on everything, and everyone around him tried to make him calm down and he just didn't," the source told ET. "He didn’t sleep at all. The hallucinations came in with lack of sleep and everything was heightened. There was a huge difficulty with being able to differentiate what is real or what is manifested by anxiety, and that's why there was this concern -- him not being able to acknowledge what is happening in real life." 

"He got to a point where his body and mind physically couldn't do it anymore," the source continued. "He hadn't been sleeping the past few weeks. Eventually, your body just gives up and that's what happened. It was a long time coming." 

While reports surfaced that West's condition has been improving since his hospitalization, another source told ET that his doctors are "reluctant to diagnose anything, mainly because a mental or cognitive disorder cannot be diagnosed after one hospital visit, but after observing someone's behavior over the course of a specific time frame."