Σήμερα ξύπνησα νωρίς, αλλά δεν είμαι ακόμα πολύ ξύπνιος.

They are related, but they are different parts of speech:

• ξύπνησα = I woke up
  This is a verb.
• ξύπνιος = awake
  This is an adjective.

So the sentence moves from an action to a state:

• Σήμερα ξύπνησα νωρίς = Today I woke up early
• δεν είμαι ακόμα πολύ ξύπνιος = I’m not very awake yet/still

English does the same thing with wake up vs awake.

ξύπνησα is the aorist form, first person singular: I woke up.

In this sentence, the aorist is used because waking up is seen as a completed event. You woke up at some point earlier today.

So:

• ξυπνάω / ξυπνώ = I wake up / I am waking up
• ξύπνησα = I woke up

Even though the sentence starts with Σήμερα (today), Greek still uses the aorist because the action is finished.

Greek often leaves out subject pronouns because the verb ending already shows who the subject is.

• ξύπνησα already means I woke up
• είμαι already means I am

So εγώ is unnecessary unless you want emphasis or contrast.

For example:

• Σήμερα ξύπνησα νωρίς = neutral, normal
• Εγώ ξύπνησα νωρίς = I woke up early, possibly contrasting with someone else

νωρίς means early, and it is an adverb.

It describes when the waking up happened:

• ξύπνησα νωρίς = I woke up early

It does not change form here. It works much like English early.

In Greek, δεν is the normal negative particle used before verbs in many everyday statements.

So:

• είμαι = I am
• δεν είμαι = I am not

That is why the sentence says:

• δεν είμαι ακόμα πολύ ξύπνιος = I’m not still/yet very awake

A learner should get used to this pattern:

• δεν + verb

Here ακόμα means something like still or yet, depending on how you translate the whole sentence into natural English.

• δεν είμαι ακόμα πολύ ξύπνιος
  = I’m still not very awake
  = I’m not very awake yet

Both are natural ways to understand it.

The core idea is that the state has not changed yet: the speaker woke up, but hasn’t become fully alert.

Yes. ακόμα and ακόμη are both used.

In modern everyday Greek, ακόμα is extremely common in speech. ακόμη is also correct and may sound a bit more formal or stylistically different depending on context and speaker.

In this sentence, either would be understood:

• δεν είμαι ακόμα πολύ ξύπνιος
• δεν είμαι ακόμη πολύ ξύπνιος

Because πολύ can mean very when it modifies an adjective.

Here:

• ξύπνιος = awake
• πολύ ξύπνιος = very awake

So πολύ is not always just much/many. Its meaning depends on what it modifies.

Examples:

• πολύ νερό = a lot of water
• πολύ καλός = very good
• πολύ ξύπνιος = very awake

ξύπνιος agrees with the person being described.

This is the masculine singular form. So it would typically be used by a male speaker, or when referring to a masculine singular person.

Other forms are:

• ξύπνιος = masculine singular
• ξύπνια = feminine singular
• ξύπνιο = neuter singular
• ξύπνιοι / ξύπνιες / ξύπνια = plural forms

So a female speaker would usually say:

• δεν είμαι ακόμα πολύ ξύπνια

Because Greek is distinguishing between:

• the event of waking up
• the state of being awake

So:

• ξύπνησα = I woke up
• είμαι ξύπνιος = I am awake

This is exactly why both forms appear in the same sentence. The speaker is saying:

1. the waking-up happened early
2. but the speaker still does not feel very awake

You could think of it as:

• action first
• condition second

Greek word order is fairly flexible, although some orders sound more natural than others.

This sentence is very natural as written:

• Σήμερα ξύπνησα νωρίς, αλλά δεν είμαι ακόμα πολύ ξύπνιος.

But you could move some elements for emphasis, for example:

• Σήμερα ξύπνησα νωρίς, αλλά ακόμα δεν είμαι πολύ ξύπνιος.
• Δεν είμαι ακόμα πολύ ξύπνιος, αν και σήμερα ξύπνησα νωρίς.

The original order is smooth and neutral. Putting Σήμερα first sets the time right away, and ακόμα before πολύ ξύπνιος sounds very natural.

A rough pronunciation guide:

• ξύπνησα ≈ KSEE-pnee-sa
• ξύπνιος ≈ KSEEP-nee-os or KSEEP-nyos, depending on how carefully it is pronounced

A few helpful points:

• ξ = ks, like in box
• υ here sounds like ee
• The accent mark shows the stressed syllable:
  • ξύπνησα → stress on ξύ
  • ξύπνιος → stress on ξύ

So the beginning ξύ- sounds roughly like ksee-.

αλλά means but.

It connects two ideas that contrast:

• I woke up early
• I’m still not very awake

So the contrast is: Even though I woke up early, I still don’t feel very awake.

It is one of the most common Greek conjunctions.

Yes, that is a very natural translation of the idea, even though it is not a word-for-word translation.

Literally, the Greek says:

• δεν είμαι ακόμα πολύ ξύπνιος
  = I am not yet/still very awake

In natural English, depending on tone and context, you might say:

• I’m not very awake yet.
• I’m still not very awake.
• I’m not fully awake yet.

So if you understand the Greek structure, several English versions can work.