As-Salaam alaikum,
Referring to those servants of Allah, Jallah-Jalalahu, who stand in nawafil (voluntary) prayer in the night, the Holy Qur'an states:--

"Their sides forsake their beds." (32:16)

On this same subject, 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-QIYAMAH' 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 'Ulama 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 let him 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 all this, I wish to advise that we all should make it a regular habit... to be offering/performing this Sunnah of Tahajjud, the voluntary night prayer accordingly, in our earthly life.

Best Wishes.