Mishnayos Pesachim Perek 10 Mishnah 8

מפטירין – I heard the language of (Psalms 22:8): “[All who see me mock me;] they curl their lips, [they shake their head],” that is to say, they open and say, and my teachers/Rabbis explained the language of taking leave from his friend, for when they leave from the meal, they should not conclude it with the Afikomen, “to take out from before you,” that is to say, remove your utensils from here and let us go and eat in another place, neither bread nor anything, and this was decreed lest one comes to eat the Passover sacrifice in two places, but it is permitted to eat other things in his first place, as long as he does not uproot himself from this group to eat them with another group. And there is in the Gemara (Pesahim 119b) one who explains that “After the Passover meal, we don’t conclude with the Afikoman,” to mean that we don’t take out types of sweet things, and after they have eaten the Passover sacrifice, they should not conclude the meal with the eating of sweet things and fruits that are regularly eaten as a desert, and even in their [own] place, so that they don’t lose the taste of the Passover [sacrifice] from their lips. And this is the most important thing. But just as we don’t conclude the meal after the Passover offering with an Afikoman, we don’t conclude after eating Matzah with an Afikoman, for they would need to eat an olive’s bulk of Matzah at the end at the time when there is no Passover sacrifice, and after that Matzah, we don’t conclude that meal with the eating of another thing.

ישנו כולם לא יאכלו – if they began to eat their Passover sacrifice and all of them went to sleep, they should not return to eat, for it appears as if they are eating in two places, and after they have slept, they dismiss from their minds from eating more, and he considers it as eating in two places, and it is a mere stringency, but the same law applies concerning Matzah in our times.

רבי יוסי אומר נתנמנמו יאכלו – it refers to the beginning where the first Tanna/teacher [of the Mishnah] said that if someone of them went to sleep, they should eat, and Rabbi Yosi comes to state that these words [refer to] if they dozed off but did not become sunk in sleep, but if some of them dozed off, those who dozed off should not eat when they awaken from their sleep. And the Halakha is according to Rabbi Yosi.