Well no I can’t disprove it because it’s not falsifiable. But there’s no evidence for it so in my opinion it’s not worthy of much consideration beyond a half-hearted musing.
I haven’t considered those things but again I would want to see evidence for them before taking them seriously. The first step would be proving that alternate universes exist. I’m not a physicist but I know this has been theorized. Is there any evidence for it yet? Then you would need to demonstrate that communication between these universes is happening in our brains somehow. At that point you might start to wonder about such things.