Can't you talk to your inner voice while awake? I don't know, but wasting a LD for that seems like too much a waste. I tried talking while awake, it works, too, and you can get pretty weird answers if you try not to interfere with what "your subconscious" is saying. Sometimes it's some kind of gibberish, sometimes something more meaningful, and sometimes it reacts to you in a different way.

It must be the very same way that talking to yourself works in dreams, but you don't have to waste them