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Birchos HaTorah cover all the talmud Torah which will take place that day. If one plans to return to his learning after attending to his daily activities, they are not considered interruptions to the mitzvah. If one did not intend to return to learning, the poskim disagree about whether it is necessary to make a new brocha. Daily activities include business involvement, napping, and tending to bodily needs. If a person goes to bed in the middle of the day and falls into a more significant sleep than just a nap, the Rishonim disagree about whether he must make a new brocha. The custom is to not to make a brocha. In deference to the majority view that maintains that a new brocha is necessary, one should have in mind to fulfill his obligation with Ahavas Olam. There are various opinions on how to define the difference between a nap and a significant period of sleep. Many Achronim say that if one changes out of his clothing, goes into bed and sleeps for at least thirty minutes, it is considered a significant sleep.
סעיף י-יב וס"ק יג, כג, כה ו־כח; ביאורים ומוספים דרשו, 17 ו־25
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