Sunan an-Nasa'i 1787
سنن النسائي#1787SahihIt was narrated from Abu Ad-Darda' who attributed it to the Prophet (ﷺ):"Whoever goes to his bed intending to get up and pray qiyam at night, then sleep overwhelms him until morning, will have recorded that which he intended and his sleep is a charity given to him by his Lord, the Mighty and Sublime
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 20:190