Question
Is there a difference between heavy sleep and light sleep in terms of breaking the wudu (ablution)?
Answer
I say, and with God's success: Yes, there is a difference. There are two types of drowsiness: heavy, which means not hearing what is said to him. This occurs in a state of lying down. And light, which means hearing what is said to him. This does not constitute an event in a state of lying down. See: Tabyin al-Haqaiq 1: 10, and God knows best.