When I was a child, I could imagine something vividly before falling asleep. And I really liked reading visual novel until the second year of my mindfulness meditation practice because creating a scene became very difficult for me. I just couldn’t imagine anything vividly any more and I can’t do visualization meditatin(which is not necessary because my practice doesn’t require it). However, my dream is very vivid and I have lucid dreams from time to time. Also, I have a good memory due to mindfulness. I AM pretty sure my phenomena is caused by my mindfulness meditation practice although I can’t prove it. Maybe someone would have similar experience like me here.