Trying to find out the reason why I was having these vivid colourful dreams, I read a lot of studies that debated that the many stages of sleep all had a part to play with our mental and physical health.
The biggest problem was not getting enough deep sleep. Too much rem sleep was not good. If you get little or insomnia, or disturbed sleep, your body's natural healing process would be interrupted.
We all feel better for a good night's rest, which coincides with not remembering your dreams.
We all feel awful after a bad night, we feel lethargic and our mental attitude towards others and lifestyle is different. Having a hangover, without alcohol, like morning is a sign of something going on. Which of course is debatable, you could be ill in many ways, or your life cycle. I always remember my dreams on these nights!
And of course we need to dream.
Since I got my life and health back and I'm fitter than I have been for a few decades, the bad nights are far fewer, I don't remember dreams and I get continuous good nights sleep.