Night prayers are any prayer you pray after Isha prayer and before the Athan of Fajr (the break of dawn).
This prayer is always prayed in odd total. The best is to pray 11 Rak’ah.
The minimum you can pray is one rak’ah but there is no ceiling for the maximum number you can pray, providing that you pray odd number; i.e. 2+2+2 …… and when you want to conclude your prayers, you should pray wither 3 or one rak’ah so that the total would be odd number.
It is not permissible to pray with the TV as this is not congregational prayer. You have to be with them for your prayer to be valid as congregation
And Allah knows best