God says
[Only they [truly] believe in Our messages],…. who are impelled to rise from their beds [at night] to call out to their Sustainer in fear and hope; and who spend on others out of what We provide for them as sustenance. -- Q.32:15,16
Behold, the God-conscious will find themselves amid gardens and springs, enjoying all that their Sustainer will have granted them [because] they were doers of good in the past [in the world]: they] would lie asleep during but a small part of the night, and would pray for forgiveness before the daybreak; and [would assign] in all that they possessed a due share unto such as may ask [for help] and such as might suffer privation.* Q.51:15-19
*Sc., “but could not beg” – and this applies to all living creatures, whether human beings or mute animals (Razi) irrespective of whether their need is of a physical or an emotional nature.
Imam Ghazali quotes thus about the famous Islamic figure: It is reported that someone dreamt of al-Junayd (may God sanctify his heart) after he had died, and asked, ‘What is the news ‘Abu I- Qasim?’ He said, ‘Those expressions were vide of the mark, and those counsels came to nothing. Nothing was of benefit to me except some small prayers I made in the middle of the night’.*
( Al-Ghazali :letter to a disciple – tr. by Tobias Mayer.)
*Allah-o-Akbar! Shows how important are the voluntary prayers at the time of Tahajjud? Desire to do it? Set the alarm clock or let someone wake you up for a few nights. It will become easy, then, for you to get up.
Prophet said
“Whoever gets up from sleep (later) in the night and says: LA ILAHA ILLAL LAHU, WAHDAHU- LA-SHAREEKA LAHU, LAHUL MULKU WA LAHUL HAMDU WA HUWA ‘ALA KULLI SHAIYIN QADEER (There is no deity except God; He is one; there is no partner for Him; His is the Kingdom, and for Him is all praise, and He has power over all things), and says: SUBHANAL LAHI, WAL HAMDU LILLAHI, WALA ILAHA ILLAL LAHU, WALLAHU AKBAR, WALA HAULA WALA QUWWATA ILLA BILLAH (Glory be to God, and praise be to God, and there is no deity but God, and God is the greatest, and there is no power and no movement except through God) and then he says: RABBIGH FIRLI (O Lord! Forgive); (after that) if he makes ablution and prays, his prayer will be accepted” -- H: Bukhari. N: Obadah-b-Swamit.