Ήμουν τόσο κουρασμένος μετά από το ξενύχτι, που δεν άνοιξα ούτε καν το λάπτοπ όταν γύρισα σπίτι.

Ήμουν is the imperfect form of είμαι (to be) and means I was.

Greek uses the imperfect for:

• background states
• ongoing situations in the past
• descriptions rather than single completed actions

So in this sentence, Ήμουν τόσο κουρασμένος... means I was so tired... and sets the scene.

By contrast, later verbs like άνοιξα and γύρισα are in the aorist, which is used for single completed actions:

• δεν άνοιξα = I didn’t open
• γύρισα = I returned / got back

So the tense contrast is very natural:

• Ήμουν = background state
• άνοιξα, γύρισα = completed events

κουρασμένος is a past participle used like an adjective, meaning tired.

It changes form depending on the gender and number of the person being described:

• κουρασμένος = masculine singular
• κουρασμένη = feminine singular
• κουρασμένο = neuter singular

So if the speaker is male, κουρασμένος is correct.
If the speaker is female, it would be:

• Ήμουν τόσο κουρασμένη...

This is one of the first things English speakers notice in Greek: adjectives usually agree with the person or thing they describe.

τόσο ... που means so ... that.

In this sentence:

• Ήμουν τόσο κουρασμένος ... που δεν άνοιξα...
• I was so tired ... that I didn’t even open...

This is a very common Greek pattern:

• τόσο + adjective/adverb + που + result

Examples:

• Ήταν τόσο αργά, που φύγαμε.
  It was so late that we left.
• Μιλάει τόσο γρήγορα, που δεν τον καταλαβαίνω.
  He speaks so fast that I can’t understand him.

So που here introduces the result clause.

Because που here introduces a result clause: so tired, that...

Greek normally uses a comma before this kind of που.

So:

• τόσο κουρασμένος, που...

This comma helps show the structure:

• first: the cause/intensity
• then: the result

It is not the same as every use of που. Greek που can mean different things in different contexts, such as:

• that
• who/which
• sometimes a more general connector

But in τόσο ... που, the comma is standard.

το ξενύχτι is a noun meaning:

• staying up all night
• a sleepless night
• sometimes a late night out depending on context

In this sentence:

• μετά από το ξενύχτι means
• after staying up all night
• or more naturally in English, after the all-nighter / after being up all night

It comes from the idea of spending the night awake instead of sleeping.

This is a useful everyday word in Greek, especially when talking about tiredness:

• Έχω ξενύχτι. = I’ve been up all night / I had a sleepless night.
• Μετά το ξενύχτι είμαι χάλια. = After staying up all night, I feel awful.

Yes, both are possible.

Greek often uses:

• μετά από + accusative and also, in many cases,
• μετά + accusative in modern everyday speech

So both of these can be heard:

• μετά από το ξενύχτι
• μετά το ξενύχτι

The version with από is very common and often feels a bit fuller or more explicit.

Important note for learners: in older or more formal Greek, μετά can also appear with the genitive, but in modern everyday Greek you will most often meet:

• μετά από + accusative or simply
• μετά + accusative

Here:

• το ξενύχτι is in the accusative, which is what you would expect.

Because άνοιξα is the aorist, which fits a single completed event.

• δεν άνοιξα το λάπτοπ = I didn’t open the laptop
  • one specific action did not happen

If you said δεν άνοιγα, that would be the imperfect, and it would usually suggest something more ongoing, repeated, or habitual, such as:

• I wasn’t opening
• I wouldn’t open
• I didn’t use to open

That would not fit this sentence as naturally, because the speaker is talking about one occasion: after getting home, they did not open the laptop.

So:

• Ήμουν = state/background
• δεν άνοιξα = one completed non-action in that past situation

ούτε καν means not even.

In the sentence:

• δεν άνοιξα ούτε καν το λάπτοπ = I didn’t even open the laptop

The two words work together for emphasis:

• ούτε adds a sense of not even / neither
• καν adds extra emphasis, like even at all

Together they strongly underline how tired the speaker was.

You may also hear:

• ούτε το λάπτοπ δεν άνοιξα
• δεν άνοιξα καν το λάπτοπ

These are related, but ούτε καν is especially emphatic.

Greek uses the definite article much more often than English.

So το λάπτοπ is very natural here, even if English might sometimes prefer:

• my laptop
• or just the laptop

Greek often uses the article with familiar, specific things that are understood from context.

Also:

• λάπτοπ is treated as a neuter noun
• so it takes το in the singular:
  • το λάπτοπ
  • του λάπτοπ
  • τα λάπτοπ (plural)

Loanwords like this are very common in modern Greek.

Both are possible, but γυρίζω σπίτι is a very common idiomatic way to say go/come back home.

So:

• γύρισα σπίτι = I got home / I returned home

This is similar to English, where we say go home, not usually go to home.

If you say:

• γύρισα στο σπίτι that is also correct, but it can sound a bit more literal: I returned to the house/home.

So the version without the article is especially natural when σπίτι means home in a general, idiomatic sense.

Compare:

• Πάω σπίτι. = I’m going home.
• Είμαι σπίτι. = I’m at home.
• Γύρισα σπίτι. = I got home.

In όταν γύρισα σπίτι, σπίτι is functioning adverbially, in an idiomatic expression meaning home.

For a learner, the most useful thing is to remember the whole phrase:

• γυρίζω σπίτι = return home
• πάω σπίτι = go home

You do not need a preposition here.

If you use a preposition, then the noun is clearly in a normal prepositional phrase:

• γύρισα στο σπίτι = I returned to the house/home

So this bare σπίτι is best learned as part of a common expression meaning home.

Yes, Greek word order is fairly flexible.

The given order is very natural:

• δεν άνοιξα ούτε καν το λάπτοπ όταν γύρισα σπίτι = I didn’t even open the laptop when I got home

But you could also say:

• όταν γύρισα σπίτι, δεν άνοιξα ούτε καν το λάπτοπ

This version puts more focus on the time frame when I got home.

Greek often moves phrases around for:

• emphasis
• rhythm
• information structure

The original sentence sounds very natural because it builds like this:

1. I was so tired...
2. that I didn’t even open the laptop...
3. when I got home

Both are correct, but when I got home is usually the most natural everyday English translation.

• γυρίζω often means return
• but in many everyday contexts, especially with σπίτι, English prefers get home or come back home

So:

• όταν γύρισα σπίτι = when I got home
• more literally: when I returned home

Learners should know the literal meaning, but also the natural English equivalent.

Yes:

• Ήμουν
  from είμαι = to be
  imperfect, 1st person singular
  I was

• άνοιξα
  from ανοίγω / ανοίγω = to open
  aorist, 1st person singular
  I opened / with δεν → I didn’t open

• γύρισα
  from γυρίζω = to return / to come back / to turn
  aorist, 1st person singular
  I returned / I came back / I got back

This sentence is a very good example of how Greek mixes:

• imperfect for background state
• aorist for specific completed actions

Almost exactly, but one word would change:

• masculine: Ήμουν τόσο κουρασμένος...
• feminine: Ήμουν τόσο κουρασμένη...

Everything else stays the same:

• Ήμουν τόσο κουρασμένη μετά από το ξενύχτι, που δεν άνοιξα ούτε καν το λάπτοπ όταν γύρισα σπίτι.

That is because κουρασμένος / κουρασμένη agrees with the speaker’s gender.