O Muzammil (folded in garments- one of the nick names of the Prophet Muhammad).
Stand in prayers at night, but not the whole night, half of it or little less, or a little more; and recite the Quran with measured tone. Soon We are going to send you a weighty message.
Surely, the getting up at night for prayer is most effective for controlling the self and most suitable for understanding the Word of Allah (the Quran) as well, because during the day you are hard pressured with worldly affairs.
Remember the name of your Rabb and devote yourself to Him exclusively.
~Quran, Surah al Muzzammil, 73: 1-9~