Voluntary Prayers

Tahajjud prayer is part of the Sunnah of the Prophet (peace and blessings of Allah be upon him) which Muslims should follow all the time; it’s not something confined to Ramadan. In his famous work, Fiqh As-Sunnah, Sheikh Sayyid Sabiq, elaborates on the subject as follows: “Tahajjud Prayer: Its excellence and merit, according to the

As-salamu 'alaykum wa rahmatu Allahi wa barakatuh, I have read in hadith that the prophet sallalahu 'alayhi wa sallam said that tahajjud prayer should be by twos and then conclude with one. My question is, is the final one the witr? Can we conclude with 3 rak'aahs of witr after the tahajjud? Because i might pray witr 3 rak'aahs usual with du'aa Qunoot, or i might pray witr with 2 rak'aahs with tasleem and then pray final one. But what i'm saying is i always would pray witr 3 rak'aahs. I appreciate your help. Jazaka Allahu khayr, wassalam. 

Asslam alaikum I want to know about the additional prayers eq; Thajud, Ishraq. how many additional prayers are there, timing and how many raka to offer