Sahih Muslim Book 003, Hadith Number 0598.

Chapter : It is permissible for a person to sleep after sexual intercourse (without a bath) and the desirability of ablution for him, and washing of the sexual organ, as he intends to eat, drink, or sleep or cohabit.

'Aisha reported: Whenever the Messenger of Allah (may peace be upon him) had sexual intercourse and intended to eat or sleep, he performed the ablution of prayer.

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