You had a very very detailed dream, about Nobara dying, Nanami dying and how everything went wrong in Shibuya, and how Sukuna had killed Gojo and many many others and how everything went horribly wrong

The dream felt like years of life and you believed everything, you thought that Nanami and Gojo had actually died and that Sukuna and Yuji were the only ones left, it felt so real, you only realized it was a dream when you were woken up by Nobara, Gojo, Megumi, and Yuji