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Tradition tells us the soul leaves the body when sleeping. Is the same true when drowsing in a chair, which is usually not a deep sleep and you are still aware of background noise?

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The Mishnah Brurah (4:34) says that ruach ra (evil spirit) only rests on the hands after sleeping sixty breaths. For how long sixty breaths is, in the Bi'ur Halachah to 4:16 he quotes a few opinions that range from 3 minutes to 3 hours. – b a Jan 6 '13 at 23:45
היכי דמי נתנמנם? - אמר רב אשי: נים ולא נים תיר ולא תיר, כגון דקרי ליה ועני, ולא ידע לאהדורי סברא, וכי מדכרו ליה מדכר. – Fred Jan 7 '13 at 2:21
@Fred can you please translate that? – Izzy Jan 7 '13 at 2:53
@Izzy "What's considered dozing? Rav Ashi said: Asleep but not asleep, awake but not awake. Such that if you call to him he will respond, but can't give a thoughtful response, and if he is reminded (what he heard) when he was dozing, he can recall it." My point is that is is not the same thing as regular sleep. – Fred Jan 7 '13 at 3:00
@ba, sounds like the makings of an answer. – msh210 Jan 7 '13 at 5:02

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