This is the 2236th most frequent Portuguese word.
sono
"Sleep" or "drowsiness."
The word "sono" here refers to the feeling of sleepiness.
Eu estou com sono e preciso dormir.
I am sleepy and need to sleep.
In this sentence, "sono" is used to signify the concept of sleep as a necessary condition.
O sono é essencial para a saúde do corpo.
Sleep is essential for the health of the body.
Here, "sono" is used to describe a potential effect of the medication that makes one feel like sleeping.