Her mother reported that the Prophet ﷺ kept a wooden cup beneath his bed in which he would urinate at night.
حدثنا محمد بن عيسى حدثنا حجاج عن ابن جريج
عن أمها أنها قالت كان للنبي ﷺ قدح من عيدان تحت سريره يبول فيه بالليل
[Hasan] Nasai reported it in Tahara, chapter on Urinating into a Vessel, no. 32, from the hadith of Hajjaj bin Muhammad, with this wording. Ibn Hibban graded it sahih (al-Ihsan): 1423, as did Hakim: 1/167, and Dhahabi agreed with him.