On occasion, when re-watching 'Doctor Who' there are episodes to skip. 'Fear Her' and 'Love and Monsters' come to mind, both episodes being universally regarded by the fandom as being two of the worst, if not the worst, episodes of 'New Who' ever made. But what sets them apart from 'Sleep No More' is the fact that despite their flaws, they have coherent plots that the viewer can actually follow.
'Sleep No More' is a "found film" kind of an episode. It is even sans the iconic intro. I'll admit that it does start out as an interesting concept. Also intriguing is the plot device that humans in this era use a machine that provides them with a month's worth of sleep. Which is ironic, because the episode was putting me to sleep while I was watching it.
Series 9 of 'Doctor Who' had, to this point, been the most solidly consistently good series to date. 'Sleep No More' takes a turn for the worst with this episode that prevents viewers from forming any connections to the characters, introduces a nonsensical monster that is less believable than Sharknado, and a "twist" ending that divorces it from the entirety of 'Doctor Who' lore.
Not only can you skip this one to save your sanity and about 42 minutes of your life, but in doing so you won't miss a single plot point. This episode may as well have never happened. So do yourself a favor and pretend that it didn't.
There is one thing I have to credit this episode for. At the very beginning it says, "Do not watch this video." I suggest that everyone take that advice.