I heard in the Rebbe’s name: A Jew’s main devotion in the winter is to wake up at midnight [and say Tikkun Chatzot, the midnight service (cf. Magen Avraham 1:4)]. In the summer, when the nights are very short [and so awakening at midnight is not practiced in the Diaspora370See Likutey Moharan I, 149; Likutey Halakhot, Rosh HaShanah 3:7; She'arit Yisrael 125.], one should still be careful to wake up early, at the crack of dawn.
שָׁמַעְתִּי בִּשְׁמוֹ שֶׁאָמַר: שֶׁעִקָּר עֲבוֹדַת אִישׁ הַיִּשְׂרְאֵלִי הוּא בַּחֹרֶף, לָקוּם בַּחֲצוֹת לַיְלָה. וּבַקַּיִץ בְּעֵת שֶׁהַלַּיְלָה קָצָר מְאֹד (שֶׁאָז אֵין עוֹמְדִין בַּחֲצוֹת (בְּחוּץ לָאָרֶץ, כַּמְבֹאָר בְּמָקוֹם אַחֵר) אָז יִזָּהֵר לַעֲמֹד בַּבֹּקֶר הַשְׁכֵּם כַּעֲלוֹת הַשַּׁחַר.
I heard in the Rebbe’s name: A Jew’s main devotion in the winter is to wake up at midnight [and say Tikkun Chatzot, the midnight service (cf. Magen Avraham 1:4)]. In the summer, when the nights are very short [and so awakening at midnight is not practiced in the Diaspora370See Likutey Moharan I, 149; Likutey Halakhot, Rosh HaShanah 3:7; She'arit Yisrael 125.], one should still be careful to wake up early, at the crack of dawn.