Mu’aad ibn Jabal (may Allaah be pleased with him) reported that the Prophet (peace and blessings of Allaah be upon him) said:
“There is no Muslim who goes to sleep remembering Allaah and in a state of purity, and when he turns over he asks Allaah for good in this world and the next, but it will be given to him.”
(Reported by Abu Dawood and Ahmad. Saheeh al-Jaami’, 5754).
Ibn ‘Abbaas (may Allaah be pleased with them both) reported that the Prophet (peace and blessings of Allaah be upon him) said:
“Purify these bodies and Allaah will purify you, for there is no slave who goes to sleep in a state of purity but an angel spends the night with him, and every time he turns over, [the angel] says, ‘O Allaah, forgive Your slave, for he went to bed in a state of purity.’”
(Reported by al-Tabaraani. Al-Mundhiri said, its isnaad is jaayid. Saheeh al-Jaami’, 3831).