Sometimes you can return to a dream just to explore it and look for optional rewards but there are 2-3 dreams where there is something that you MUST find or you'll get stuck later in the campaign. If that's the case, the victory script of the dream usually gives you a hint of what you are looking for (so you will know if you found it the first time around or if you must return).
Sometimes you can return to a dream just to explore it and look for optional rewards but there are 2-3 dreams where there is something that you MUST find or you'll get stuck later in the campaign. If that's the case, the victory script of the dream usually gives you a hint of what you are looking for (so you will know if you found it the first time around or if you must return).