Is there a hadith that sleep does not invalidate the ablution?
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The questioner : ... that the Companions would nod their heads while praying and not perform ablution ...
The Shaykh : And if the head nods, is it deep sleep?
The questioner : ...
The Shaykh : Yes, it is the same thing. Even a person lying down sometimes lies down, and if he passes wind, he is aware of it. Therefore, the best thing said regarding the issue of sleep is that if he were to pass wind, he would not be aware of it, then his ablution is invalidated. But if he were to pass wind, he would be aware of it, then it is not invalidated, whether he is sleeping while lying down, leaning, sitting, or standing.
The Shaykh : And if the head nods, is it deep sleep?
The questioner : ...
The Shaykh : Yes, it is the same thing. Even a person lying down sometimes lies down, and if he passes wind, he is aware of it. Therefore, the best thing said regarding the issue of sleep is that if he were to pass wind, he would not be aware of it, then his ablution is invalidated. But if he were to pass wind, he would be aware of it, then it is not invalidated, whether he is sleeping while lying down, leaning, sitting, or standing.