Is it normal not to remember your dreams sometimes

I usually have a good dream recall, but since I started experimenting with B6 my lucid dreams and dream recall got worse. Any tips(yes I do DJ)

Yeah it is normal, since dream memory usually gets "wiped out" and pushed aside by your brain. I don't know why, because brain study hasn't found out enough information yet, but my quess would be that your brain recognises that it is dream and thus it decides that it is not that relevant for your memory. I notice that if I woke up quickly ( for noice or something else ) my dream memories start quickly fade away unless I spend time and effort to focus on them and memorize them.

-Un

Indeed it is normal.
You'll be forgetting plenty more. ;)
Dream recall can be temperamental.