Kanye West had "nightmares" about wife Kim Kardashian West before being hospitalised.
The 39-year-old rapper was left "shaken up" after his spouse - with who they share three-year-old daughter North and 11-month-old son Saint - was robbed at gunpoint in Paris, France, earlier this year, which led him to have regular night terrors about his partner's horrific ordeal prior to being admitted to Ronald Regan UCLA Medical Centre in Los Angeles, California, last week.
A source told US Weekly: "[Kanye] was having nightmares.
"He's been shaken up ever since the robbery in Paris. It did a number on him as much as Kim.
"The mere thought that anything could happen to her sent him in a tailspin. He wasn't sleeping and he was having nightmares about it.
"The robbery triggered everything."
And the 'Famous' rapper - who cancelled the remaining dates of his 'Saint Pablo Tour' just before his health scare - has revealed he cut his concert short because he was concerned for his family and their welfare and didn't want to be away from his brood whilst he was performing.
The source added: "He really couldn't do his shows without her around. That's what made him worse. He didn't want to be away from her ... [The robbery] was just as hard for him, but he tried to keep going. He would never have cancelled the tour unless things were bad.
"Kim is his family and the only family he really has now. They took him in and embraced him. So seeing Kim traumatised did a major number on him."
Speaking about the rapper – who had a highly-publicised rant on stage just before being admitted to hospital - a source told PEOPLE: “In the past, he snapped back quickly. This has been going on for years. In the past when Kanye seemed to struggle, no one took it too seriously. The attitude was more like it was just Kanye being Kanye.
“Things would go back to normal. This time is much different.
“Without having Kim by his side during the tour as planned, Kanye wasn’t able to snap back. Kim being absent because of her own struggles seems to be why things are different with Kanye this time.”
But the rapper's hospitilisation is said to be "making their marriage stronger".
Meanwhile, the 'Keeping Up With the Kardashians' star has been "helping to feed" Kanye whilst he's been in hospital.
Speaking previously about the 36-year-old television personality, another source said: "Kim has been amazing. She knew he couldn't keep going the way he was. She has been by his side through all of this, helping to feed him and laying by his side."