Silsilah as-Sahihah 417 — Virtue of sleeping with wudu at night

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever spends the night in a state of ablution, an angel spends the night in his lower garment. Whenever that person wakes up during any part of the night, the angel says: O Allah! Forgive Your such-and-such servant, for he spent the night in a state of ablution."