Quote Originally Posted by Captain Sleepalot View Post
Or, you can have a nagging feeling or suspicion that you may be dreaming...which can lead to some dream manipulation but not full blown awareness or lucidity.

Hence, a semi-lucid dream.
If that happens and I give it up and don't become lucid it's a non-lucid, if I do make the connection it's a lucid. It's like an on-off switch IMO. That fine line is a transition period, but not really a state itself.