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Questo materasso è comodissimo, ci dormo sodo.

Questo materasso è comodissimo, ci dormo sodo.
This mattress is very comfortable, I sleep soundly on it.
From Lesson 361:Adjectives as adverbs (parlare chiaro)·Italian

Questions & Answers about Questo materasso è comodissimo, ci dormo sodo.

Why is sodo used here instead of an adverb ending in -mente?
Sodo is basically an adjective meaning hard or firm, but here it is used as an adverb modifying the verb dormire. In Italian, certain adjectives can be used adverbially without changing their form. Dormire sodo is a common fixed expression meaning to sleep soundly or heavily.
If multiple people were sleeping soundly, would sodo become plural?
No. Because sodo is functioning as an adverb in this context, it is invariable. It will always stay in its masculine singular form regardless of who is sleeping. Even if you said noi dormiamo sodo (we sleep soundly), the word does not change.
What exactly is the pronoun ci doing in the second clause?
Here, ci acts as a locative pronoun meaning 'on it' or 'in it'. It replaces the phrase su questo materasso (on this mattress). Using ci is the most natural way to link the action of sleeping back to the mattress without repeating the noun.
Could I just say molto comodo instead of comodissimo?
Absolutely. Comodissimo is the absolute superlative form of comodo. While molto comodo is perfectly correct, using the -issimo suffix is extremely common in spoken Italian to emphasize that something is very or highly comfortable.

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