When we first started we used to open and close the door to avoid the hens sleeping in there and we thought it would establish the right behaviour before adding an automatic door to the front. However, the hens just sleep in there anyway which leads to us having to change the bedding more frequently. Since we have an automatic door the benefits of not getting up so early would be wasted if we had to open the internal door so we just carry on. The ladies do pefer to lay behind the wall furtherest away from the coop door so it adds that privacy element. Also it is one extra step in cleaning. My opinion is it is pointless is you wish to make use of an automatic door but if you plan to manually open the coop in the mornings anyway, it keeps your bedding clean a lot longer.