Riyad as-Salihin, Book 9, Hadith 1198 (In-Book) ⓘ
'Aishah (may Allah be pleased with her) reported: We used to prepare for the Messenger of Allah a Miswak (tooth-stick) and the water for making Wudu'. Whenever Allah wished to awaken him from sleep at night, he would brush his teeth with Miswak, make Wudu', and perform Salat.[Muslim].
وعن عائشة رضي الله عنها، قالت: كنا نعد لرسول الله، سواكه وطهوره، فيبعثه الله ما شاء أن يبعثه من الليل، فيتسوك ويتوضأ ويصلي. ((رواه مسلم)).