Talk:Princess Luna/@comment-25559529-20160709034615/@comment-27161581-20160709142507

No, from the Do Princesses Dream of Magic Sheep transcript, making a shared dream requires a significant amount of effort, even from Luna. The conversation is as follows.
 * Princess Luna: It is true. With so many dreams to hide in, I do not know how I can catch it.
 * Twilight Sparkle: Hmm... What if every-pony in Ponyville were having one dream?
 * Princess Luna: I... can create shared dreams, yes, but for so many ponies at once? I have never done anything like that. The amount of power it would take...

Whether or not Luna gains energy from visiting dreams is left ambiguous as far as I can tell. I personally doubt such a thing. Luna's domain is the night, more specifically the moon, and she is already gains power from it. I doubt she would also gain power from visiting dreams. If she did, then there would likely be some indication of her becoming stronger in Do Princesses Dream of Magic Sheep, instead of weaker as she travels through the dreams of the mane six.