Jami` at-Tirmidhi, Book 34, Hadith 2443 (In-Book) ⓘ
'Abu Sa'eed narrated that the Prophet (s.a.w) said: "The most truthful of dreams are in the last hours of the night."
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا ابْنُ لَهِيعَةَ، عَنْ دَرَّاجٍ، عَنْ أَبِي الْهَيْثَمِ، عَنْ أَبِي سَعِيدٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم " أَصْدَقُ الرُّؤْيَا بِالأَسْحَارِ "
also referenced under: Hadith 2274 (Reference) & Volume 4, Book 32, Hadith 2274 (DarusSalam)