Вночі, коли в кімнаті тихо, мені легко читати.

Вночі is an adverb meaning at night or during the night.

Although it historically comes from в + ночі, in modern Ukrainian it is normally treated as a fixed adverb and written as one word. You may also see уночі; it means the same thing. Ukrainian often alternates в / у for smoother pronunciation.

The words коли в кімнаті тихо form a subordinate clause introduced by коли (when).

So the structure is roughly:

• Вночі — time expression
• коли в кімнаті тихо — subordinate clause
• мені легко читати — main clause

Because the subordinate clause is inserted before the main clause, it is separated by commas:

• Вночі, коли в кімнаті тихо, мені легко читати.

This is standard Ukrainian punctuation.

Коли introduces a time clause and means when.

Here it connects the idea of reading easily with the condition/time situation of the room being quiet:

• коли в кімнаті тихо = when it is quiet in the room

So it tells you under what circumstances the main statement is true.

Кімнаті is the locative case of кімната (room).

After в / у when talking about location (in, inside), Ukrainian usually uses the locative:

• в кімнаті = in the room

Compare:

• в кімнату = into the room (motion, accusative)
• в кімнаті = in the room (location, locative)

So here кімнаті is used because the sentence describes where it is quiet.

Тихо here is not an adjective modifying a noun. It is an adverb / predicative word meaning quietly or, more naturally in this structure, it is quiet.

In Ukrainian, words like тихо, холодно, тепло, темно are often used in impersonal sentences:

• У кімнаті тихо. = The room is quiet. / It is quiet in the room.
• Надворі холодно. = It is cold outside.

So тихо is the correct form because it describes the overall situation, not a specific noun.

Yes, from an English-speaking point of view it may feel like something is missing, but this is normal in Ukrainian.

In the present tense, Ukrainian usually omits the verb "to be" (є) in sentences like this:

• в кімнаті тихо literally looks like in the room quiet
• natural English: it is quiet in the room

So the idea of is is understood, even though it is not spoken.

Мені is the dative case of я (I), and this is a very common Ukrainian pattern.

The construction:

• мені легко читати

literally means something like:

• to me, it is easy to read

Ukrainian often uses the dative with words like:

• легко = easy
• важко / тяжко = hard
• треба = necessary
• можна = possible / allowed

So мені does not mean the speaker is the grammatical subject in the English way. It marks the person experiencing the ease.

Because the pattern is:

• [dative person] + легко / важко / можна + infinitive

So:

• мені легко читати = it is easy for me to read

The infinitive names the action in a general way. It does not say I am reading right now; it says reading is easy for me in that situation.

Compare:

• Я читаю = I am reading / I read
• Мені легко читати = It is easy for me to read

They are similar, but not the same.

• мені легко читати = it is easy for me to read

  • focuses on how difficult or easy the action feels
  • often depends on circumstances

• я легко читаю = I read easily

  • focuses more on the manner or ability of the subject
  • can suggest fluency, ease, or lack of effort

In your sentence, мені легко читати is the better choice because it matches the idea that when the room is quiet, reading feels easy.

Yes, at least the main part of it is.

The core statement мені легко читати is an impersonal construction. There is no normal nominative subject like я. Instead, Ukrainian uses:

• a person in the dative: мені
• a predicative word: легко
• an infinitive: читати

This type of sentence is extremely common in Ukrainian.

Yes. Ukrainian word order is fairly flexible, though different orders change the focus or emphasis.

The given version:

• Вночі, коли в кімнаті тихо, мені легко читати.

puts the time setting first.

You could also say, for example:

• Коли в кімнаті тихо, вночі мені легко читати.
• Мені легко читати вночі, коли в кімнаті тихо.

These are all understandable, but the original sounds natural and neatly sets up the context before the main point.

Yes. У кімнаті and в кімнаті both mean in the room.

Ukrainian often alternates у and в for euphony—to make pronunciation smoother. The choice depends on surrounding sounds and rhythm more than on meaning.

The same applies to:

• вночі
• уночі

So the sentence could also be written with у in some places, depending on style and sound.

The main stresses are:

• вночі́
• коли́
• в кімна́ті
• ти́хо
• мені́
• ле́гко
• чита́ти

Stress is important in Ukrainian, especially for learners, because it is not always predictable from spelling.