This episode is a slight rip off from a CreepyPasta story that some of us may know.
Not saying it's a complete rip off but the concept of it seems so. Gatiss, we know...

Full Read of The Russian Sleep Experiment. Source; Creepy Pasta
http://creepypasta.wikia.com/wiki/Th...eep_Experiment

Audio Version if you're too lazy to read it.
https://www.youtube.com/watch?v=MEwbfnCpKA4

Now that you mention it, there are a couple of parallels, but Sleep No More was more set up to be a sort of Sci-Fi equivalent of a "haunted/cursed video tape" trope from horror films.

I love The Russian Sleep Experiment, by the way. I haven't come across many genuinely good Creepy Pastas, but the Russian Sleep Experiment is one of the few ones I've really liked.

The sand man who could not sleep

Gattis concept derivative shocker