I have had days where I could swear I woke up in another dimension. I vividly remember what I dreamed those nights, and how I felt for the next few days. It was like, everything is the same way I left it when I went to sleep, but me myself, I feel odd. As if either I have slept for months and I'm trying to get familiarized with everything again, or as I just said, I woke up in an alternate reality where everything was the same, but everything was a bit different at the same time.
I can definitely understand why some people subscribe to the idea of solipsism. It def feels often at times like life is just one big simulation. The fact that others happen to also subscribe to that ideology is enough to convince me that it's egocentric. Who am I to say that the entire world only exists in my mind when someone else reading this post clearly knows that they exist as well.
These things keep me up at night. What is existence? How can an objective reality exist if nobody is there to perceive it? These things keep me up at night, literally, and I wish something like, 'God created everything" was enough to suffice my curiosity.