Sunan an-Nasa'i 443
سنن النسائي#443SahihIt was narrated from Anas that the Messenger of Allah (ﷺ) said:"If anyone of you feels drowsy during his Salah, let him go and take a nap
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 Bukhari
In-book reference: 4:49