Hi,
I want to know how I can tell when I'm about to / when / if I'm in an astral projection?

In other words I want to know what it is like to astral project. Examples could be perception, feelings, movement etc...

What is it like to have an astral projection and know it's real? Or what proof can I make / test out to make sure the astral projection is real and I know that I've astral projected?

Thanks.