Sukkah 26a-27a
סוכה כ״ו א — ד"ה רָבָא לְטַעְמֵיהּ
Sukkah 26a:9
The Gemara discusses the nature of 'teshvu ke'ein taduru' and the practical obligations of dwelling in the sukkah, including sleeping there and exemptions for one who suffers discomfort. It is a core sugya for this question.
רָבָא לְטַעְמֵיהּ, דְּאָמַר רָבָא: מִצְטַעֵר — פָּטוּר מִן הַסּוּכָּה. וְהָא אֲנַן תְּנַן: חוֹלִין וּמְשַׁמְּשֵׁיהֶם פְּטוּרִים מִן הַסּוּכָּה. חוֹלֶה אִין, מִצְטַעַר לָא! אָמְרִי: חוֹלֶה — הוּא וּמְשַׁמְּשָׁיו פְּטוּרִים, מִצְטַעֵר — הוּא פָּטוּר, מְשַׁמְּשָׁיו לָא. תָּנוּ רַבָּנַן: אוֹכְלִין אֲכִילַת עֲרַאי חוּץ לַסּוּכָּה, וְאֵין יְשֵׁנִים שֵׁינַת עֲרַאי חוּץ לַסּוּכָּה. מַאי טַעְמָא? אָמַר רַב אָשֵׁי: גְּזֵרָה שֶׁמָּא יֵרָדֵם.
The Gemara comments: Rava conforms to his line of reasoning, as Rava said: One who suffers in the sukka is exempt from the mitzva of sukka. The Gemara asks: But didn’t we learn in the mishna that the ill and their caretakers are exempt from the mitzva of sukka? By inference, with regard to an ill person, yes, he is exempt; with regard to one who suffers, no, he is not exempt. The Sages say: With regard to an ill person, he and his caretakers are exempt; however, with regard to one who merely suffers in the sukka, he is exempt but his caretakers are not. The Sages taught in a baraita: One may eat a casual meal outside the sukka, but one may not take even a brief nap outside the sukka. The Gemara asks: What is the reason for this distinction? After all, sleeping in the sukka is an obligation just as eating in the sukka is an obligation. Rav Ashi said: It is prohibited to nap outside the sukka due to a decree lest he fall into a deep sleep.