What Is This?

[Chubysnow]

So here I am with a question. I have just started trying to astral project but I have been meditating for a while now. When I try to astral project I first do some color breathing for a while and then I imagine I am falling endlessly. Two things happen here that I am unsure of. The first one is that my closed eye vision becomes Grey and it starts rippling. The second is I feel pressure on my abdomen. What are these things?

[CFTraveler]

Signs of trance.  They're normal.
The chest tightening is thought to be the heart chakra activating.  Once you project you will probably have more sensations in this area.  Don't be alarmed, it's part of the process.