When I was a kid, I thought this song was spooky. As an adult, I still find it so... why it's never been used as the theme in a horror movie, I'll never know.
And the video for the Laura Branigan version is like a little horror movie, so it's a perfect match to the song.
Here's a less creepy modern (from 2011) cover by the Danish outfit, ironically, named Infernal. However, as the video progresses, the horror aspect of the song fully asserts itself. It's nice to see that even though they took a dance tune with spooky undertones and made it even more up-tempo, they paid attention to the details. That's a rate thing, I think.
And here's the version recorded by Raf, the song's co-writer. It was a hit all across Europe in 1984, at the same time that Branigan's version was enjoying an even greater level of popularity. If memory serves, this was actually the first version I encountered. It's not as atmospheric as Branigan's version--and it feels more like the "creatures of the night" in the song are just party-goers and clubbers rather than mysterious monsters--but it was certainly deserving of the hit status it enjoyed.
Here's a version by Sunday Girl. It tries to take the horror aspects of the song and bring them to the forefront. The video succeeds. The song itself? Not so much.