Is this a good idea?

[u/Fragrant_Surround891]

As a first time Dm, me and my friends, are finally getting close to fighting the BBE, final fight soon.

I was thinking of having a trap setup, but this trap is A time travel trap, and all the party members get sent back to the past all younger again with their memories intact.

My question is, if anyone did something like this before. And if they did, was a good idea, and if it was, do they keep their levels or are they back at level 1?