Pesachim10: 8
אֵין מַפְטִירִין אַחַר הַפֶּסַח אֲפִיקוֹמָן.  יָשְׁנוּ מִקְצָתָן — יֹאכֵלוּ; כֻּלָּן — לֹא יֹאכֵלוּ.  רַבִּי יוֹסֵי אוֹמֵר: נִתְנַמְנְמוּ — יֹאכֵלוּ; נִרְדְּמוּ — לֹא יֹאכֵלוּ.
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.