Nap adjectives are listed in this post. Each word below can often be found in front of the noun nap in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing NAP.
brief, comfortable, daily, day
daytime, first, good, hour
last, little, long, minute
needed, nice, quick, quiet
refreshing, second, short, sound
Hope this word list had the adjective used with nap you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.