 On days when "Tachanun" is not recited during daytime prayers, only "Tikkun Leah" is recited (although Sefardim do not recite Tikkun Chatzos at all on Shabbat and Yom Tov ).The Tikkun Chatzot is an individual service; a minyan is not needed for performing it, although some have the custom to recite it with a minyan.At midnight, one sits on the ground or a low stool, takes off his shoes (non-leather shoes are permitted to be worn, as these are not halakhically considered shoes), and reads from the prayer book.