Cleaning one's mouth with siwak when waking up at night.

The hadith narrated by Hudhaifa tells us about the nightly ritual of the Prophet Muhammad ﷺ. Every time he woke up in the middle of the night, he would use a twig called siwak to clean his mouth. This is an example of how important it was for him to maintain good oral hygiene and keep himself clean at all times. It also shows us that even small acts like cleaning our mouths can be part of our daily routine and help us stay healthy and hygienic. Additionally, this hadith teaches us that we should take care of ourselves and strive for excellence in all aspects of life, including personal hygiene.