Because you are weak

Luna’s efforts to remove the nightmare spell seeds from Applebloom’s dream fabric in my Equestria dreamscape has to begun to take its toll on the princess. link

There are occasions in my dreams when I am effectively a phantom who can observe events unfolding in my dreams even when I am not physically present for them. I am unable to take action while in this state, however I can often travel to distance locations and even enter the dreams of characters in my dream. This was one of those moments.

Celestia has expressed concern over Luna repeated exposure to such violent and horrific illusions. True Luna is the defender of dreams, but these grotesque dream sequences are more than just nightmares in ponies’ minds, they’re deliberate magical attempts to mold and break the mind and will of those they are being inflicted upon. Celestia was worried that despite Luna’s precautions that her younger sister could be endangering herself to what amounted to mental contamination from the spells.

As result of Luna confronting and removing the nightmare seeds is the Princess of the Night has begun experiencing nightmares hers own. One evening I got to witness one of these nightmares unfold before my eyes.

After this particular nightmare, Celestia insisted that Luna let her older sister take a dream walk through her head to see if any seeds had some how taken root despite their precautions. Now Celestia does not have the same skill level that Luna has in this field, but based on her observations Celestia felt confident that Luna did not have any nightmare seeds growing in her. However she insisted that Luna take a week off before resuming her work with Applebloom.

To be continued.