Siman 478

Just as after the Pesach offering one may not eat anything, so that the taste of the Pesach offering is not lost from him, so too with the afikoman, which is a remembrance of the Pesach offering—one may not eat any food item after it, so that the taste of the matzah is not lost. And likewise, it is forbidden to drink any beverage (Magen Avraham) except for water, so as not to lose the taste, aside from the two cups that one is obligated to drink by the law of the Seder. And just as it is forbidden to eat the Pesach offering in two places, so too the afikoman. And it is no better than if one interrupted with sleep, which is forbidden as will be explained, so too in two places.

And even in one room, they should not eat the afikoman at two tables. However, during the rest of the meal there is no concern, for we are only particular regarding the afikoman, which is a remembrance of the Pesach offering. And similarly, if one began to eat the afikoman, and slept and awoke—he does not return to eat, according to the law of the Pesach offering, for this is like two places. And members of a group, some of whom slept in the middle—they return and eat when they have awakened, since the rest did not sleep. And if all of them fell into a deep sleep and awakened—they shall not eat, for it is like two places. If they all slumbered, which is to say: asleep yet not asleep, awake yet not awake, such that if they call him he answers, but he does not know how to return a reasoned thought—he may eat it, for this is not considered sleep. And all of this is only regarding sleep after the start of eating the afikoman, and not like the one who is stringent regarding the entire meal.

And know that regarding that which we call the matzah eaten at the end "afikoman" – there is seemingly no reason for this, for we have learned: One may not conclude after the Pesach offering with an afikoman. That is to say: that they should not eat anything. And "afikoman" is an expression of "afiku man," meaning types of sweets (Rashbam). If so, how do we call it "afikoman"? And it must be said that this is the explanation: "afikoman" – "afiku man," meaning: only this food and no more. Or the intention is regarding after its eating, afikoman, meaning: to not bring any more food. However, post facto, if one ate something after the afikoman – he is not obligated to return and eat the afikoman. And so too all types of drink – it is forbidden to drink after it except for water, which does not destroy the taste. And all types of water are permitted, such as seltzer and lemonade. And there is one who permits the drinking of all drinks, for only eating is forbidden and not drinking (Chok Yaakov, and so it is implied in the Taz in siman 479, subsection 2). However, in any event, it is simple that all types of prepared waters – it is permitted to drink after the Seder, and so too licorice and the like. And it will be further explained in siman 481.