S1E20 : Prison of Dream

Nearing Hades's Cathedral, Tenma suddenly finds himself standing before his village, seemingly undamaged. He can't shake the feeling something is wrong as Alone and Sasha – who appear as their children selves – tell him everything up until now has been a dream... the truth, however, is the other way round. Carrying out Hypnos's orders, the dream gods trapped Tenma, Yato, Yuzuriha and Sisyphos in dream prisons, deep inside their realm – the Dream World.