Chapter: Evidence that sleeping while sitting does not invalidate wudu’
Qatida reported: I heard Anas as saying that the Companion of the Messenger of Allah ( صلی اللہ علیہ وسلم ) dozed off and then offered prayer and did not perform ablution. He (the narrator) said: I asked him if he had actually heard it from Anas. He said: By Allah. yes.
Authentic