Salaah

Reciting an aayah incorrectly in salaah

Q: 

1. If an Imaam recited an aayah of Surah Naba incorrectly in the fardh of Esha i.e. instead of reciting لاَ يَتَكَلَّمُونَ إلّٰا مَنْ أَذِنَ لَهُ الرَّحْمٰنُ, he recited لاَ يَتَكَلَّمُونَ مَنْ أَذِنَ لَهُ الرَّحْمٰنُwill the salaah break?

2. If the salaah breaks, then if among the muqtadis there was a person who was a musaafir, should the musaafir muqtadi repeat four rakaats or two rakaats?

3. If the mistake was in Esha salaah and the Esha has to be repeated, then will a person who has performed witr after the esha salaah have to repeat the witr salaah as well? 

Taking sleeping tablets

Q: Is it permissible to use or prescribe sleeping pills? After using them, sometimes one is not in his conplete sense and sometimes says what will not usually say in public? Would Namaz be valid in this state? Can it be used if one is unable to sleep? Or can it be used sometimes when one wants to releive himself of worries?