Naruto Next Generations, a sequel series to Naruto, are just an illusion and that Naruto Uzumaki and Sasuke Uchiha are still trapped in the Infinite Tsukoyomi, an illusion created by the main antagonist, Kaguya Otsutsuki.
According to this theory, the events of Boruto, which follow the adventures of Naruto's son, Boruto Uzumaki, as he trains to become a ninja and discovers his own unique abilities, are just a dream or illusion that Naruto and Sasuke are experiencing while trapped in the Infinite Tsukoyomi.