What is the limit of light sleep that does not invalidate the ablution?
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Question:
May Allah reward you. Honorable Shaykh, this questioner asks: What is the amount of light sleep that does not break the ablution?
Answer:
That which does not cause the mind to depart, that which does not cause the mind to depart. This does not break the ablution if one is sitting. However, if one is leaning or lying down, sleep breaks the ablution absolutely, because one is not aware of oneself. But if one is sitting firmly and in control of oneself, light sleep does not break the ablution.
May Allah reward you. Honorable Shaykh, this questioner asks: What is the amount of light sleep that does not break the ablution?
Answer:
That which does not cause the mind to depart, that which does not cause the mind to depart. This does not break the ablution if one is sitting. However, if one is leaning or lying down, sleep breaks the ablution absolutely, because one is not aware of oneself. But if one is sitting firmly and in control of oneself, light sleep does not break the ablution.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3436/1481] ما ضابط النوم اليسير الذي لا يبطل الوضوء؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.