Ibn 'Umar (May Allah be pleased with them) reported:
Some of the Companions of the Prophet (ﷺ) saw Lailat-ul-Qadr (Night of Decree) in their dreams in the last seven nights of Ramadan, whereupon the Messenger of Allah (ﷺ) said, "I see that your dreams all agree upon the last seven nights. Whosoever seeks it, let him seek it in the last seven nights."[Al-Bukhari and Muslim].
App reference: Book 9, Hadith 200
Arabic/English book reference: Book 9, Hadith 1190