i suppose i'm a natural. i learned at a young age due to nightmares as described in earlier comments.
the following apply to me:

*sensitive to paranormal stuff (when i am choosing to believe in it)
*heightened senses - i think..? i'm not totally sure what that really means.

but also. i think something that we "naturals" might have in common is that we were all plagued with nightmares / night terrors when we were younger or possibly still have them.

also i agree that although i'm a "natural" i still put a lot of work, effort, and thought into lucid dreaming. i sort of feel goofy saying it, but it is really a whole lifestyle.