One of the common 'mr nightmare animated sleepover stories' could be about cursed objects. For example, a doll that seems to have a life of its own and causes all kinds of trouble. It might move around the room when no one is looking or give off an evil vibe. Also, stories about ghosts that haunt a particular place, like an old abandoned school, are quite popular.
You can start by searching on video - sharing platforms. Just type in 'mr nightmare animated sleepover stories' in the search bar and see what comes up. There are likely to be channels dedicated to this kind of content.
It's hard to say which specific stories Mr. Nightmare read. It could vary depending on his interests and the availability of content. You might find clues in related fan discussions or reviews.
One thing that might make it special could be its unique take on horror. It might combine different elements of horror that we don't often see together. For example, mixing elements of slasher horror with supernatural elements.
The 'Mr Nightmare 3 Horror Stories' could potentially have a wide range of themes. It might include stories about vengeful spirits seeking revenge for past wrongs. These spirits could haunt the living, causing all sorts of strange and terrifying events. There could also be stories about people getting trapped in nightmarish situations, like being stuck in an abandoned asylum where they start to experience unexplainable phenomena. And perhaps some stories are centered around the idea of a pact with the devil or other dark forces, leading to a series of horrifying consequences.