Dreams feel like reality, that's why it's so easy to accept them as actually happening. Becoming lucid is nothing more that questioning whether or not the things around you make rational sense. Reality Checks (or RCs) are how we know.

The mind is capable of creating so much! Our imaginations are only limited to the sum of our experiences and our personalities (which leads to very few limitations, in fact). As to physical sensations, I had a very interesting LD where at one point there was a duality where I could feel both my sleeping, unmoving body, and my dream body which was walking down a hallway. It was so cool! Sometimes LDs can feel more real than reality, if that makes sense.

(Welcome to DV Enjoy your stay!)