What determines the clarity of dreams?

i have wondered this ever since i started a dream journal. as most people know, dreams have different clarities/vividness. what i dont understand is are the dreams plainly just not a very clear dream, or is it that you cant remember it clearly therefore the dreams seems dont seem very clear/vivid. maybe its a combination of both. i am not sure if this makes sense but i would appreciate an replies.

thank you :cool:

I heard that there was a memory pill (forget what its called) that improves your dream recall, and the people who use it get very vivid dreams. Also, I’ve noticed that the longer it’s been since I’ve had a dream, the blurrier the memory of the dream gets, so I’d say that it all depends on you’re dream recall.