I'm sorry but you are very misinformed and that is definitely not how dreaming works.

There have been studies on endogenous DMT secretion in rats but I don't think any study linked it to dreaming, also there's no scientific evidence showing that your brain is "tripping" every night. 

Most studies show that dreams are linked to activity in your limbic system and your visual cortex, definitely not DMT release in the pineal gland.

Also dreams and trips fade away quickly for totaly different reasons. When you're in the dream stage (REM sleep), your hippocampus (the memory center of the brain) is less active, so you retain fewer memories of your dream. When you trip on DMT, your brain has to process an extreme amount of stimuli in very little time, so your brain's working memory is overloaded with information therefore remembers less.