Think of it this way. You will probably remember more details about a beautiful landscape if you are actually THERE, rather than just seeing it on TV.

When you are dreaming normally, you are viewing everything passively, as if you were watching TV. If you're lucid, you obviously pay more attention because you're actually there.


As a side note, most people have a greater desire to remember lucids than they to non-lucids. That also has a lot to do with it.