Sonno vs. sogno
The Italian words sonno and sogno are often confused by learners as they both relate to sleeping. However, sonno refers to the physical state or need for sleep, while sogno refers to the dream you experience during sleep or an aspiration you have.
Sonno
A1This word means sleep, the physiological state of rest, or sleepiness, the feeling of needing to sleep.
Ho tanto sonno, vado a letto.
(I am very sleepy, I'm going to bed.)
Il sonno dei bambini è molto leggero.
(The sleep of children is very light.)
Hai bisogno di almeno otto ore di sonno per notte.
(You need at least eight hours of sleep per night.)
Mi è venuto un colpo di sonno mentre guidavo.
(I suddenly felt very sleepy while I was driving.)
Il rumore mi ha disturbato il sonno.
(The noise disturbed my sleep.)
Sogno
A2This word means dream, referring to the stories and images in our minds during sleep. It also refers to a cherished aspiration or hope for the future.
Stanotte ho fatto un sogno stranissimo.
(Last night I had a very strange dream.)
Il mio sogno nel cassetto è scrivere un libro.
(My secret dream is to write a book.)
Vivere a Parigi era il suo più grande sogno.
(Living in Paris was her biggest dream.)
Non mi ricordo mai nessun sogno la mattina.
(I never remember any dreams in the morning.)
Questa vacanza è un sogno che diventa realtà.
(This vacation is a dream come true.)
Summary
In short, sonno is the physical act or need for sleep. If you are tired and want to rest, you have sonno. Sogno is the mental movie you experience during sleep (a dream) or an ambition you have when you are awake (a life dream).