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Sleeping before the night prayer is forbidden
One should not sleep before the night prayer, nor have discussions after it. Abu Barza al-Aslami related that the Prophet, upon whom be peace, loved to delay the night prayer (which was called darkness, al-'atmah) and he hated sleeping before it and talking or discussions after it." (Related by "the group.") In another saying by Ibn Mas'ud, it is reported, "The Messenger of Allah ordered us not to talk after the night prayer." (Related by Ibn Majah.) The reasons behind this are: sleep may make a person miss the night prayer in its best time, or it may cause him to miss the congregational prayer, and talking and socializing afterwards would cause one to misappropriate a time from which he could greatly benefit. If one wants to sleep and has someone to wake him up, or he is discussing a beneficial matter, then it is not disliked.
Said Ibn 'Umar, "The Prophet would discuss with Abu Bakr some of the affairs of the Muslims during the night, and I was with him." (Related by Ahmad and at-Tirmidhi, who said it is hassan.) Reported Ibn 'Abbas, "I slept in the home of Maimunah one night when the Prophet, upon whom be peace, was there. I watched to see how the Prophet prayed during the night. He talked with his wife for a while and then slept." (Related by Muslim.)
The time of the morning prayer (fajr)
The time of the morning prayer begins with the true dawn and lasts until sunrise. It is preferred to pray it early in its permissible time. Abu Mas'ud al-Ansari reported that the Messenger of Allah prayed the morning prayer in the darkness (of the dawn). Another time, he prayed it when the dawn was shining (or glowing). Then after that, he always prayed in the darkness (of the dawn) until he died." (Related by Abu Dawud and al-Baihaqi. Its chain is sahih.) Said 'Aishah, "Believing women would pray the morning prayer with the Prophet, upon whom be peace, being enveloped in their clothing. They would return to their homes after the prayer and no one could recognize them due to the darkness (of the dawn)." (Related by "the group.") Rafa' ibn Khadeej related a hadith in which the Prophet, upon whom be peace, said, "Make the morning prayer at daybreak, as your reward will be greater." In another version it states, "Make the morning prayer at the shining (time of the dawn), as your reward will be greater." (Related by "the five." At-Tirmidhi and Ibn Hibban grade it as sahih.) It refers to the time that one finishes the prayer, not the time when one begins it.
That is, one should make the recital long so that one is in prayer until the dawn becomes "shiny." This is what the Prophet, upon whom be peace, used to do, for he would recite between 60 and 100 verses. It also means to make sure that the dawn has come.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari