Wieczorem śpiewam córce kołysankę, a ona zamyka oczy po kilku minutach.

Wieczorem means in the evening or sometimes in the evenings, depending on context.

Polish often uses certain time words by themselves, without a preposition. So:

• Wieczorem = in the evening
• Rano = in the morning
• Nocą = at night

So Wieczorem śpiewam... is a very natural way to begin the sentence.

Śpiewam is the 1st person singular present tense of śpiewać (to sing).

It means:

• I sing
• sometimes, depending on context, I am singing

Here it most naturally gives a habitual or repeated meaning:

• In the evening, I sing my daughter a lullaby...

So the speaker is describing something they typically do.

Córce is the dative singular of córka (daughter).

It is used because the verb pattern here is:

• śpiewać coś komuś = to sing something to someone

So:

• kołysankę = the thing being sung
• córce = the person receiving it

Compare:

• Śpiewam kołysankę córce. = I sing a lullaby to my daughter.

So córce means to my daughter, not my daughter as a subject or direct object.

Because kołysanka is a feminine noun, and here it is the direct object of the verb śpiewam.

The direct object usually goes in the accusative case. For many feminine nouns ending in -a, the accusative singular changes to -ę:

• kołysanka = nominative
• kołysankę = accusative

So:

• Śpiewam kołysankę = I sing a lullaby

In Polish, a often connects two clauses with a sense of contrast, change of subject, or simple transition, while i usually just means and in a more straightforward way.

Here:

• Ja do something: śpiewam córce kołysankę
• ona does something: zamyka oczy

So a sounds very natural because it shifts attention from I to she:

• ..., a ona zamyka oczy... = ..., and she closes her eyes...

It is not a strong contrast like but, but it does mark a change in focus.

Yes, Polish often leaves subject pronouns out, because the verb form already shows the subject.

So in some contexts, ona could be omitted. But here it is included to make the switch in subject especially clear:

• first clause: I sing
• second clause: she closes her eyes

So a ona helps highlight that now she is the one doing the action.

It adds clarity and a slight emphasis, similar to:

• ..., and she closes her eyes...

Yes, zamyka oczy literally means closes her eyes.

Polish often does not use a possessive word like her, his, or my when talking about body parts, if the owner is obvious from context.

So:

• zamyka oczy = she closes her eyes
• not usually zamyka swoje oczy, unless you want special emphasis

Using swoje here would sound heavier and less natural in an ordinary sentence.

Very often, yes.

Literally it means she closes her eyes, but in this context — after hearing a lullaby — it strongly suggests that she is getting sleepy or falling asleep.

So the sentence has both:

• a literal meaning: she closes her eyes
• a natural implied meaning: she starts drifting off / falls asleep

After po, Polish usually uses the locative case.

So in:

• po kilku minutach = after a few minutes

both words are in forms required by that structure:

• kilku = locative plural form used here with po
• minutach = locative plural of minuty

Base form:

• minuta = minute

Here:

• po minucie = after a minute
• po kilku minutach = after a few minutes

Because the preposition po changes the case.

Without a preposition, you might see forms like:

• kilka minut = a few minutes

But after po, you need the case required by po, so the phrase changes to:

• po kilku minutach = after a few minutes

So the difference is not about meaning, but about grammar.

Most naturally, it describes a habitual or repeated action.

So the sense is:

• In the evening, I sing my daughter a lullaby, and after a few minutes she closes her eyes.

This sounds like something that regularly happens.

Polish present tense can describe:

• what is happening now
• what usually happens

Context tells you which meaning is intended.

Polish word order is fairly flexible, so the basic meaning would stay the same, but the emphasis can change.

For example:

• Wieczorem śpiewam córce kołysankę...
  Focus starts with the time: In the evening...

• Córce śpiewam wieczorem kołysankę...
  Stronger emphasis on to my daughter

• Kołysankę śpiewam córce wieczorem...
  Stronger emphasis on the lullaby

The version you have sounds natural and neutral, with the evening setting introduced first.

The verbs śpiewam and zamyka are imperfective because the sentence describes an action as a process or as something that happens regularly.

• śpiewać = imperfective to sing
• zamykać = imperfective to close

This fits a routine description:

• every evening, this is what happens

If perfective forms were used, the sentence would feel more like completed one-time events rather than a typical recurring situation.