Sometimes for becoming lucid sometimes even an opposite thing is required: switching from being blindly absorbing by “external” subjects to noticing the “internal” state of mind (though everything is in fact internal, naturally).
It sounds to me like dream yoga a bit, or a form of meditation.
Sounds like a good technique to me. Especially for people with sound stable minds. 
ooo Just when I had given up on lucidity!
Daydreaming is my, erm, specialty xD I do it all the time in school! Seriously. This technique sounds like it’s worth a try!