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Whenever the Messenger of Allah (ﷺ) intended to sleep after having sexual intercourse, he performed ablution as for the prayer before going to sleep.

Whenever the Messenger of Allah (ﷺ) had sexual intercourse and intended to eat or sleep, he performed the ablution of prayer.

"The Messenger of Allah would become sexually impure and then sleep without water until he got up later on and taken a bath."

"When the Messenger of Allah wanted to sleep and he was sexually impure, he would perform ablution as for prayer."

He used to become sexually impure at night, then he would want to sleep. The Messenger of Allah told him to perform ablution and then go to sleep.