Commentary for Berakhot 5:10
למאי נפקא מינה למיקרי קריאת שמע למאן דגני בבית אפל ולא ידע זמן קריאת שמע אימת כיון דאשה מספרת עם בעלה ותינוק יונק משדי אמו ליקום וליקרי.
and ask what is its purpose ? It is for the reading of the Shema' on the part of one who sleeps in a dark room and does not know when is the time for reading the Shema'. Therefore, when the woman converses with her husband and the child sucks at the breast of its mother, let him get up and read it.
Reshimot Shiurim on Berakhot
Tosafos D''H "L'man D'gani." "and if you say, doesn't Rebbi Eliezer hold (later on Daf 9b) "until one recognizes between [the color] of techeilet and karti (a dark green)" [is what is required in order to recite] the Kriyat Shema of the morning? In any case, since one knows when Amud HaShachar occurs, [by the time] one arises and prepares himself [for the morning prayers,] the time will have already arrived." It is clarified from Tosafos that he reasons that Kriyat Shema of the morning is dependent of the time of "m'sh'yakir," and "m'sh'yakir"prevents, even after the fact, that if one recites it before "m'sh'yakir"
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Windows were rare in houses, especially of the poor. Cf. T. A. I. p. 42, and p. 347 n. 539.
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Tosafot on Berakhot
And if you'll ask, we know that Rabbi Eliezer holds that in order to read Krias Shema it must be light enough to recognize between blue and green? We can answer that since he knows when the rising of the sun is, by the time he gets up and gets ready it will be the right time.
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