Unusual Question - Please Help!

Hello. Something has been weighing heavily on my mind over the last few days. I have an anxiety disorder so my nervousness is magnified. (I wasn’t sure whether to post here or the anxiety section. But since the question is more general, I decided to post here.) This is based off of something I recently read. I have a fairly high IQ, and I know it’s ridiculous, but it’s a worry nonetheless. Maybe someone here can help.

My concern is that our consciousness dies in our sleep and is replaced by a copy. At first, I thought that couldn’t be the case due to dreams and brain waves that are recorded during sleep studies. But then I read that’s not enough evidence for consciousness to continue while we sleep. They said that dreams could just be memories with the illusion of consciousness when we awaken.

So on to my question. Are brainwaves and dreams proof that our consciousness doesn’t die during sleep?

Help is much appreciated. Thank you.