Hello,

Recall is the foundation of lucid dreaming, you can't know if you have had a lucid dream if you don't remember it. I find when my recall gets poor (it varies from great to terrible) then I will take a week or two out of lucid dreaming and just focus on remembering my dreams, this only has to be done about every few months, but it is really worth it. There is nothing worse than attempting to LD and not even get non lucids, which can be very fun as well.
It may seem like you can't dream, but you can so perceiver, when you get up in the morning lay there for 5 minutes, trying to remember a dream and anything you remember, write it down.

Hope it helped