They are believed to give extra reward to the person performing them, similar to sunnah prayers.
According to the following tradition (hadith), performing nafl prayers help one to draw closer to Allah and attain success in the afterlife: Rabi'ah ibn Malik al-Aslami narrated that the Prophet said: "Ask."
"[3]The time for the Ishraq prayer begins fifteen to twenty minutes after sunrise and consists of two Raka'ahs.
[4] Praying ishraq is considered to yield greater rewards than performing the lesser Umrah according to some traditions.
[citation needed] Duha prayer begins after sunrise and ends at meridian, and is generally thought to include at least two raka'ahs, though in some traditions the number is four or even twelve.
[6][7][8][9][10][citation needed] According to the Sunni thought, performing this prayer is believed to be effective in seeking forgiveness for one's sins.
The supererogatory morning prayer has been narrated from Muhammad, through paths that have reached mass-narration levels – from 19 to over 30 companions – according to Imam al-Tabari, al-`Ayni in `Umdat al-Qari, al-Haytami, al-Munawi, and al-Qari in Sharh al-Shama'il, Ibn Hajar in Fath al-Bari, al-Kattani in Nazm al-Mutanathir, and as per the monographs compiled by al-Hakim and al-Suyuti as well as the recensions of Abu Zur`a al-`Iraqi in Tarh al-Tathrib, Ibn al-Qayyim in Zad al-Ma`ad, and al-Shawkani in Nayl al-Awtar.
Muhammad is reported to have said that whoever performs the four rakaats before or after the Dhuhr prayer with constancy, God makes the fire of Hell haram (forbidden) for him.
[Mishkat,(Hasan-Chain) p. 104; Tirmizi, Abu Da'ud, Nisai 1814, Ibn Majah] Muhammad is reported to have said that after the worshipper prays the four rakaats of Dhuhr salah, the doors of heaven are opened, i.e. the salah becomes accepted by God, and the cause of its acceptance comes down on the worshipper as rays of mercy.