Why do nightmares disappear as soon as one recollects the Buddha during a nightmare?

When the mind consciousness recollects the Buddha in daily life, it perfumes the manas; the manas holds the Buddha in its heart and also understands the benefits of reciting the Buddha's name. When encountering a dangerous situation in a dream, it directly raises the thought of the Buddha and recites the Buddha's name—the name comes out spontaneously, without the mind consciousness needing to deliberate and decide to recite. Being able to recite the Buddha's name in a dream is true recollection of the Buddha (buddhānusmṛti), and one can thereby resonate with the Buddha. Once the Buddha's power blesses and protects, the nightmare vanishes. The environment turns according to the mind; dreams are even more illusory than waking reality, so as soon as the mind of reciting the Buddha appears, the nightmare realm disappears, and the state of mind transforms from suffering into calm and serenity.