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Who says we’re not doing that already and just calling it dreams?

What have you been eating before sleep? My dreams happen on Earth!

Why is it Earth and not an Earth-like planet populated by other people who are also travelling when they sleep?

What if there were 100 billion of us in total?

Well how do you know you're on earth when you wake up? What if you just pick a random earth-like planet each time, and don't realise it's a new life?

How do you know it is you who wakes up each morning and not just a new life with your memories and feelings who can't tell the difference?

Rip yesterday me.

Good point. I agree

kinda easy to disprove, just think about it for a sec.