ANSWER: You can make dua in your Salah, both fard and voluntary, in all your sujood and in the last tashahud, before making salam and in your own language, providing you don’t know how to make that particular dua in Arabic.

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ANSWER: You can say them as soon as the fajr time begins, you don’t have to wait until you finish praying fajr

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ANSWER: You should not do this as it’s an innovation.  You can randomly say it once in a while and also during the whole day but not specifically before sleeping. 

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