Sunan Ibn Majah, Volume 2, Book 7, Hadith 1693 (DarusSalam) ⓘ
It was narrated from Ibn ‘Abbas that the Prophet said: “Seek help by eating Suhur for fasting that day, and by taking a brief rest (at midday) for praying at night.”
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا أَبُو عَامِرٍ، حَدَّثَنَا زَمْعَةُ بْنُ صَالِحٍ، عَنْ سَلَمَةَ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، عَنِ النَّبِيِّ ـ صلى الله عليه وسلم ـ قَالَ " اسْتَعِينُوا بِطَعَامِ السَّحَرِ عَلَى صِيَامِ النَّهَارِ وَبِالْقَيْلُولَةِ عَلَى قِيَامِ اللَّيْلِ " .
also referenced under: Hadith 1693 (Reference) & Book 7, Hadith 1763 (In-Book)