Nirtzah

Some drink the fourth cup of wine before the piyutim of Nirsah, while others drink the fourth cup after the piyutim of Nirsah.

Piyutim of Nirtzah

1. Some have the custom to say Chasal Siddur Pesach after the 4th cup of wine and some say it after Chad Gad Yah. Others don't say Chasal Siddur Pesach at all.
2. It is customary to say LeShanah HaBah BeYerushalayim. Some say it once, while others say it three times. Some say it after the piyut Ki Lo Naeh.
3. Some say Az Rov Nissim the first night and Ometz Gevurtecha the second night. Some say both piyutim on both nights and some say Az Rov Nissim the first night and both the second.
4. It is customary to say Chad Gad Yah in Nirtzah.
5. Some have the custom to say Shir HaShirim after the Seder.
6. It is customary to sing Echad Mi Yodeh and some do so in the vernacular.

Going to sleep after the Seder

1. According to Sephardim, before going to sleep, one should say the full Kriyat Shema with 3 paragraphs. If it before Chatzot, one should say the Bracha of HaMapil with Shem UMalchut, and if it's after Chatzot one should say this bracha without Shem UMalchut.

Sources

Time	Topic
Before Pesach	Month of Nissan - Shabbat HaGadol - Bedikat Chametz - Biur Chametz - Bitul Chametz - Tanit Bechorot - Erev Pesach - Selling Chametz - Erev Pesach That Fell out on Shabbat - Candle Lighting on Yom Tov - Kashering the kitchen for Pesach - Which foods, medications, cosmetics, and toiletries are Chametz? - Kitniyot - Chametz of a non-Jew - Owning Chametz on Pesach
The Seder	Kaddesh - Urchatz - Karpas - Yachatz - Maggid - Rachsa - Motzei Matzah - Maror - Korech - Shulchan Orech - Tzafun - Barech - Hallel of the Seder - Nirtzah - Kriyat Shema Al HaMitah
Pesach	- Setting the Table (The Seder plate) - Arvit of the night of Pesach - Leaning during the Seder - Required Amount of Matzah and Wine for the Seder - The four cups of wine - Matzah
After Pesach	Issru Chag - Chametz which a Jew owned on Pesach - Pesach Sheni