My parents are at an age when they can just about cope with Sky and its seemingly endless amount of channels.

This, Christmas, however, I set them up with Netflix (to complicate matters further) and at first they were resistant to it.

Fast-forward to the end of Black Mirror: Bandersnatch, though, and both their heads were rolling around on the living room floor.

They’ve now got the likes of The Crown, Making A Murderer and Bird Box all in their watch list ready to be binged on in the coming weeks.

But there’s another to add to that list.

One that’s apparently so terrifying that it’s leaving viewers unable to sleep.

That programme? You.

Based on a 2014 novel of the same name, You is an American psychological thriller that follows a charming but creepy stalker.

Specifically, it centres around New York bookshop owner Joe Goldberg – played by Gossip Girl star Penn Badgley – who falls in love with a customer named (Elizabeth Lail) and becomes dangerously obsessed with her while going to increasingly extreme levels to keep her by his side.

It’s a horrifying series, and one that explores the dangers of social media culture with an emphasis on a lack of digital privacy as well as toxic/controlling relationships.

Flocking to Twitter, fans have shared how deeply unsettling the series is:

You is on Netflix now.

If you haven’t seen the trailer, watch it below:

Images via Netflix