I've recently been having problems remembering my lucid dreams. My issue, is that when I start LDing, I don't particularly want to stop. I will wake up from an LD, remember it and could write it down, but I choose to instead risk remembering it fully the next day and go back directly into another LD. If i wake up and go to write it down, I won't be able to easily WILD into another one. It's a bit of a tradeoff.

What's worked for me, is that during the LDs i intentionally try to remind myself to remember them when I wake up. That seems to work very well. I have never kept a dream journal, even though i probably should start because I really want to remember all my LDs in great detail.