Not graded
Companion’s words (mawquf) Sunan ad-Darimi 612
أَخْبَرَنَا مُحَمَّدُ بْنُ سَعِيدٍ حَدَّثَنَا حَفْصٌ عَنْ ابْنِ جُرَيْجٍ قَالَ قَالَ ابْنُ عَبَّاسٍ تَدَارُسُ الْعِلْمِ سَاعَةً مِنْ اللَّيْلِ خَيْرٌ مِنْ إِحْيَائِهَا
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 612, 266).