"I heard An-Nu'man bin Bashir on the minbar in Hims saying: "We prayed Qiyam with the Messenger of Allah (ﷺ) during Ramadan on the night of the twenty-third until one-third of the night had passed, then we prayed Qiyam with him on the night of the twenty-fifth until one-half of the night had passed, then we prayed Qiyam with him on the night of the twenty-seventh until we thought that we would miss Al-Falah- that is what they used to call suhur."

Sunan an-Nasa'i Book 20, Hadith 9