'Aishah (may Allah be pleased with her) reported:
We used to prepare for the Messenger of Allah ﷺ a Miswak (tooth-stick) and the water for making Wudu'. Whenever Allah wished to awaken him from sleep at night, he ﷺ 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)).