Response:

There is no value in attending to these dreamlike thoughts in meditation. 

They are only a variation of the other types of thoughts that come up between your attention to your breathing. 

The fact that they are dreamlike or fantasy-like only indicates that you are in a more refined state of awareness in your meditation. 

While you are meditating, you will get the most benefit from your practice if you return your attention to your breath. 

Love,

Deepak