TikTok is flooded with various trends ranging from beauty tips to disturbing challenges.

While certain trends are surprisingly useful – like the budgeting tip cash stuffing – some others often come with experts warning users not to replicate them online.

One eerie trend that's gone viral on TikTok claims to transport people to a parallel dimension in their sleep – and right in time for Halloween, too!

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Here's everything you need to know about the creepy F74 or Floor 74 challenge taking over our social media feed, including how to do it and whether it's real or not.

What is the F74 TikTok trend?

The F74, or Floor 74, is a TikTok trend that allegedly originated from Japan and claims to take you to a parallel dimension in your sleep.

The aim of the F74 challenge is to survive your trip to another dimension, with failure to escape meaning you'll supposedly be stranded forever in the parallel dimension.

The trend has been making the rounds on TikTok for years but has gone viral more recently.

How to do the F74 challenge?

To start the F74 TikTok challenge, the participant is required to write F74 on their wrists with a red marker before going to sleep.

The challenge claims that after a while, people will 'wake up' in a dark long hallway with multiple doors.

People will apparently also hear lots of creepy voices behind them in the dream, but you aren't supposed to look back.

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We need to go through the right door, that's been marked F74, to escape our dream and wake up in the same state we went to sleep.

If a challenger fails to find the right door in 10 hours, the challenge claims they will be taken to a white room by a demonic creature and will never be able to escape.

Is the F74 TikTok trend real?

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As scary as the F74 challenge sounds, many have rubbished it, saying that they've woken up to their normal lives at the end of the challenge.

The suggestion that we won't be able to wake up if we fail the challenge has also been rubbished. For some people, the dreams apparently never even occurred.

The F47 challenge is thought to be connected to the concept of lucid dreaming and despite being considered bogus, it continues to remain popular with horror fans.

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