They pour him a third cup, [and] he blesses for his food.  A fourth [cup, and] he completes the Hallel over it and recites the “Blessing of the Song” over it.  Between these cups, if one wishes to drink, he may drink; between the third and fourth [cups] he may not drink.

One may not conclude [the feast] after (eating) the pesach with dessert.  [If] some fell asleep, they may eat; [if] all, they may not eat.  R' Yose says: [If] they dozed, they may eat; [if] they fell into a deep sleep, they may not eat.