ANSWER: Your friend is correct. Witr is the last prayer you pray for the night and should be prayed after tahajjud. But if you are afraid not to wake up, you can pray it before going to bed as you are doing at the moment. 

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ANSWER: Husband can do that to her but a wife cannot do that to herself as this would be considered as masturbation which is not permissible. 

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ANSWER:  There’s no importance.  Kindly refer to the following link(s): https://youtu.be/-kyx-39YKkY  

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