Ho lavorato tanto, perciò i miei occhi sono così stanchi da non restare aperti.

Questions & Answers about Ho lavorato tanto, perciò i miei occhi sono così stanchi da non restare aperti.

Why use the infinitive da non restare instead of just saying che non restano?
This is the core of the implicit consecutive clause. When the subject of the consequence is the same as the subject of the main action (here, i miei occhi are both tired and not staying open), Italian prefers using da + infinitive. You would use che + conjugated verb if the subjects were different, like: I am so tired that my eyes don't stay open (Sono così stanco che i miei occhi non restano aperti).
Could I use talmente instead of così in this sentence?
Yes! così... da and talmente... da mean exactly the same thing. You can easily say sono talmente stanchi da non restare aperti.
Why is aperti plural when it comes right after the infinitive verb restare?
Even though it follows an infinitive, aperti still acts as an adjective describing the main subject of that clause, i miei occhi. Since occhi is masculine plural, the adjective must agree with it.
What is the exact role of perciò here, and can I use quindi instead?
perciò means 'therefore' or 'for this reason'. It links the cause (ho lavorato tanto) to the effect. You can absolutely swap it with quindi or dunque, which are completely interchangeable coordinating conjunctions in this context.

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