Abdullah bin Abbas (may Allah be pleased with them both) narrates that one night I stayed with my maternal aunt, Lady Maymunah (may Allah be pleased with her). I saw that the Messenger of Allah (peace and blessings be upon him) got up at night and performed a light ablution from a water-skin. He described the ablution of the Prophet (peace and blessings be upon him) as very light and brief. Abdullah bin Abbas (may Allah be pleased with them both) says: I also performed ablution in the same way and stood on his left side. The Prophet (peace and blessings be upon him) turned me and made me stand on his right side. Then, as much as Allah willed, the Prophet (peace and blessings be upon him) prayed, then slept until he began to snore. Then the caller to prayer came to him, so he stood up for prayer without performing ablution again.