Fasting: Sexual Intercourse with a Fasting Wife While She Is Asleep
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1650
If a fasting man in the month of Ramadan has sexual intercourse with his fasting wife while she is asleep, one kaffārah becomes obligatory for him. Furthermore, his wife's fast is valid and kaffārah is not obligatory for her.