Hadithcore
Sahih Muslim, 768
sahih

Abu Huraira reported Allah's Messenger (ﷺ) as saying When any one of you gets up at night, he should begin the prayer with two short rak'ahs.

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ هِشَامٍ، عَنْ مُحَمَّدٍ، عَنْ أَبِي، هُرَيْرَةَ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ إِذَا قَامَ أَحَدُكُمْ مِنَ اللَّيْلِ فَلْيَفْتَتِحْ صَلاَتَهُ بِرَكْعَتَيْنِ خَفِيفَتَيْنِ.

References2 variants
In-Book Reference
Book 6, Hadith 235
USC-MSA web (English) reference
Book 4, Hadith 1690 (deprecated numbering scheme)
Sharh · explanationclick to expand
Qiyām al-Layl is the source of honor for the believer, and its merit is great. It is the best prayer after the obligatory prayers. The pure Shariah encourages its performance and demonstrates its great reward and virtue. In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) demonstrates part of the understanding related to Qiyām al-Layl. He informs that when someone wants to perform Qiyām al-Layl, he should commence his prayer with two short Rak‘ahs. This is to break the desire for sleep, and their shortness is more suitable for repelling it, given the successive movements involved therein. Moreover, if he offers long Rak‘ahs at the beginning, this will be heavy for his body, and he will probably reduce his Rak‘ahs of Qiyām al-Layl, due to the heaviness he feels. But if he is gradual in prolonging the prayer, he may become more active and desire to increase the prayer and make it longer, after this gradation. This is because he has prepared his body and activated it with these two Rak‘ahs. It is said: Starting Qiyām al-Layl with two short Rak‘ahs serves to initiate loosening the knots that the devil ties on a person's head after he sleeps, and these knots are completely loosened when the prayer is completed..
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