Perform ablutions before sleeping if one becomes sexually impure at night.

This hadith is about the importance of performing ablution before going to sleep. It was narrated from Abu Sa'eed Khudri that he used to become sexually impure at night and wanted to sleep without performing ablution. The Messenger of Allah then advised him to perform ablution and then go to sleep. This hadith teaches us the importance of cleanliness and purity in our lives, especially when it comes to our physical bodies and spiritual selves. It also emphasizes the need for us as Muslims to be mindful of our actions, even when we are tired or sleepy, so that we can maintain a high level of cleanliness in all aspects of life.