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The sentences:

We all dream; we do not understand our dreams, yet we act as if nothing strange goes on in our sleep minds, strange at least by comparison with the logical, purposeful doings of our minds when we are awake.
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About the second "strange" above, does it modify nothing like the first one?
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Simple answer: Yes. Emotion: smile

"...as if nothing (which is) strange - (nothing which is) strange at least by comparison with the logical, purposeful doings of our minds when we are awake - goes on in our sleep minds."

The difficulty of following a construction like the one I've shown above is the most likely reason for the rearrangement of the components of the sentence into the form you cited.
Comments  
I understand completely.

Thanks, Jim!