The World Federation One Stop Fiqh

Ruling 1599

If someone is junub on a night of the month of Ramadan and is not confident that if he goes to sleep he will wake up before the time of ṣubḥ prayers, in the event that he is unmindful of the fact that he must perform ghusl after waking up, and he goes to sleep and remains asleep until the time of ṣubḥ prayers, then based on precaution, qaḍāʾ becomes obligatory for him.