‘Ā'ishah (may Allah be pleased with her) reported: We used to prepare for the Messenger of Allah (may Allah's peace and blessings be upon him) his tooth-stick and the water he used for making ablution. Then, Allah would awaken him whenever He willed during the night, and he would brush his teeth with the tooth-stick, make ablution, and perform prayer. Authentic hadith - Narrated by Muslim