Meditation (Zikr)
In the name of GOD, Most Gracious, Most Merciful
[17:79] During the night, you shall meditate for extra credit, that your Lord may raise you to an honorable rank.
Some Quranic Verses Encouraging Meditation
[3:17] They are steadfast, truthful, submitting, charitable, and meditators at dawn.
[9:112] They are the repenters, the worshipers, the praisers, the meditators, the bowing and prostrating, the advocators of righteousness and forbidders of evil, and the keepers of GOD's laws. Give good news to such believers.
[17:79-80] During the night, you shall meditate for extra credit, that your Lord may raise you to an honorable rank. And say, "My Lord, admit me an honorable admittance, and let me depart an honorable departure, and grant me from You a powerful support."
[25:63-66] The worshipers of the Most Gracious are those who tread the earth gently, and when the ignorant speak to them, they only utter peace. In the privacy of the night, they meditate on their Lord, and fall prostrate. And they say, "Our Lord, spare us the agony of Hell; its retribution is horrendous. It is the worst abode; the worst destiny."
[26:217-220] And put your trust in the Almighty, Most Merciful. Who sees you when you meditate during the night. And your frequent prostrations. He is the Hearer, the Omniscient.
[39:9] Is it not better to be one of those who meditate in the night, prostrating and staying up, being aware of the Hereafter, and seeking the mercy of their Lord? Say, "Are those who know equal to those who do not know?" Only those who possess intelligence will take heed.
[50:39-40] ... praise and glorify your Lord before sunrise, and before sunset. During the night you shall meditate on His name, and after prostrating.
More from Sura 73:
[73:1] O you cloaked one.
[73:2] Meditate during the night, except rarely.
[73:3] Half of it, or a little less.
[73:4] Or a little more. And read the Quran from cover to cover.
[73:5] We will give you a heavy message.
[73:6] The meditation at night is more effective, and more righteous.
[73:7] You have a lot of time during the day for other matters.
[73:8] You shall commemorate the name of your Lord, to come ever closer and closer to Him.
[73:20] Your Lord knows that you meditate during two-thirds of the night, or half of it, or one-third of it, and so do some of those who believed with you. GOD has designed the night and the day, and He knows that you cannot always do this. He has pardoned you. Instead, you shall read what you can of the Quran. He knows that some of you may be ill, others may be traveling in pursuit of GOD's provisions, and others may be striving in the cause of GOD. You shall read what you can of it, and observe the contact prayers (Salat), give the obligatory charity (Zakat), and lend GOD a loan of righteousness. Whatever good you send ahead on behalf of your souls, you will find it at GOD far better and generously rewarded. And implore GOD for forgiveness. GOD is Forgiver, Most Merciful.