In ayat 16 of Surat Sajdah of the Holy Qur'an (32:16), Allah Ta'ala says:--
"THEIR SIDES FORSAKE THEIR BEDS." This is in reference to those servants of Allah who engage in the voluntary prayer(s) in the night. This is the same prayer about which the Noble Messenger of Allah, Sallallahu alaihi Wasallam, said:--
"Hold fast to night prayer, for it was the way of the righteous before you, a way of drawing closer to your Lord,
an expiation for wrong deeds, and a shield from sin." [Tirmidhi].
"Qiyam" literally means standing up, particularly after sleeping, just as we say... 'YUOM AL-QIYAMH' for Day of Judgement as we rise to stand before Allah Subhanahu Wa Ta'ala, after much rest in our graves. That is why sleep is like a daily death, and Qiyam is to rise from it. Whoever stands the night in prayer, Allah will make easy for him in standing on the Day of Judgement, as some of our 'Ulam observe.
Sayyadi Ibn Abbas, may Allah be pleased with him, also advised, "Whoever loves to find the long standing of the day of Resurrection less difficult should show himself to Allah in the darkness of the night prostrating and standing, fearing the Hereafter and hoping for Mercy of his Lord."
In view of this, we should all resolve to be offering the voluntary night prayer, otherwise known as Tahajjud, ... every night, for the rest of our life in this world.