Hello @djalboe, Welcome to Connect. I also drink a lot of water and a few cups of coffee in the morning. I do often have dreams but I've had them most of my life even as a kid which is long before starting with the coffee. I did drink a lot of water when I was younger, probably more than I do now. You mentioned vaping 3mg nicotine juice. I'm not a doctor and have no medical background but I've read that vaping can affect your sleep. Here's an article on the topic:
-- Nicotine and Sleep: https://www.sleepfoundation.org/physical-health/nicotine-and-sleep

You might also be interested in other discussions and member comments on dreams and sleep - https://connect.mayoclinic.org/search/discussions/?search=dreams%20+sleep

Have you thought about trying to make any lifestyle changes that might help or discussed it with your doctor?