This is the 2163rd most frequent Portuguese word.
noites
"Nights."
Here, 'noites' is used in its plural form to refer to nighttime periods in general at a specific location.
As noites na praia são tranquilas e agradáveis.
The nights at the beach are calm and pleasant.
In this case, 'noites' is combined with an adjective ('frias') to describe the specific characteristics of these night periods.
Durante as noites frias de inverno, prefiro ficar em casa.
During cold winter nights, I prefer to stay at home.
Here, 'noites' refers to the time frame when the activity of studying occurred, emphasizing the routine during nighttime.