وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، - رضى الله عنهما - أَنَّ رِجَالاً، مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم أُرُوا لَيْلَةَ الْقَدْرِ فِي الْمَنَامِ فِي السَّبْعِ الأَوَاخِرِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَرَى رُؤْيَاكُمْ قَدْ تَوَاطَأَتْ فِي السَّبْعِ الأَوَاخِرِ فَمَنْ كَانَ مُتَحَرِّيَهَا فَلْيَتَحَرَّهَا فِي السَّبْعِ الأَوَاخِرِ ‏"‏ ‏.‏

Ibn 'Umar (Allah be pleased with them) reported that some persons among the Companions of the Messenger of Allah (PBUH) were shown Lailat- ul-Qadr while sleeping in the last week (of Ramadan). Thereupon Allah's Messenger (PBUH) said: I see that your dreams agree regarding the last week; so he who wants to seek it should seek it in the last week (during the night). Translation Not Available

Book Ref: Sahih Muslim Book 13 Hadith 2617
Web Ref:  Sahih Muslim Book 6 Hadith 1165 a