Muwatta Malik 40
موطأ مالك#40SahihYahya related to me from Malik from Nafithat Ibn Umar used to sleep sitting and then would pray without doing wudu
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Sahih
In-book reference: 2:9