In Arabic there aren't Evening & Night period of time . We have only morning time , evening time and bed time .
So we say at the morning time.." Sabah Al Khair " and the reply is " Sabah Al Noor "
At the evening time we say " Masaa Al Khair " and the reply is " Masaa Al Noor "
At the bed time we say " Tesbah Ala Khair " and the reply is " Wa Anta Min Ahlooh " ...
That's all ....:)