Baretti: A dictionary of the English and Italian languages
Sónn-o, s. m. dim. Sónn-ellíno, Sónn-eréllo, Sónn-étto, sleep, repose, rest. Aver —, to be sleepy or drowsy. Mi muojo di —, I am very sleepy. Romper il —, to break one's sleep. Schiacciare un —, (vulg.) to take a sleep. — eterno, death. In —, nel —, in or during sleep, while sleeping. Cascar dal —, to have a great desire to sleep. Dar —, to court sleep. Svegliar dal —, to awake.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
sonno: sleepe, slumber, a nap of sleepe. Vsed also for night, rest, quietnesse or calmenesse. Also for Sóno, they are.