S9 - Sleep No More - Sorry, nope, still don't get it

I rewatched this again today and I actually quite like bits of it it I just don't understand what the hell is going on. How much of it is 'real'? Is any of it? Reece Shearsmith's character says he's just there to make a good story to keep us watching... So did The Doctor even land?

What are other people's thoughts on the plot of this story?