Q:

Going back to a previous way of life

Going back to a previous way of life:
  At first I'm really a type of strife,
  In the middle I once depicted slumber,
  And in the end I may help number.  

Find the word.

A:

Going back to a previous way of life:   

 feudalist - one perhaps living in medieval Europe  

At first I'm really a type of strife,  

 feud - a mutually hostile situation. 

In the middle I once depicted slumber,  

 Salvador Dali - painted "Sleep" in 1937  

And in the end I may help number.  

 list - a way to order or number. 

