Why this word is great
LUCIDITY — [Noun] The quality of being expressed or understood with clarity and coherence, or the state of conscious awareness within a dream. From Late Latin lūciditās ("brightness"), from Latin lūcidus ("clear, bright, shining"), from lūx, lūc- ("light"). Unlike clarity, which often denotes a surface transparency, or coherence, which implies a logical linkage of parts, lucidity is the mind's own light switched on. It is the crystalline thought that arrives just before dawn, the perfect sentence that dispels all fog, or the eerie, weightless moment within a nightmare when you know you are dreaming and choose to fly. The light it casts is a cold and transient mercy.