I’ll guess astral projection, praying mantis like aliens, greys, past lives, etc.

And my own theory is that there are multiple ways to tap into human collective subconscious and that is the source of the shared experiences people report. We have to remember other mammals can be born and minutes later walk. Many animals have incredibly intricate instincts that are encoded in their DNA. It seems very obvious we do too but we aren’t consciously aware of most of them. When we alter our state of consciousness with various techniques the hidden collective subconscious bursts through.

Just my opinion and influenced by Jung obviously.