Я хочу прибрати кімнату перед сном.

Because хочу means I want, and after want Ukrainian normally uses the infinitive of another verb, just like English:

• Я хочу спати = I want to sleep
• Я хочу читати = I want to read
• Я хочу прибрати = I want to clean/tidy up

So хочу прибрати literally works like want to clean up.

This is a question of aspect, which is very important in Ukrainian.

• прибирати = imperfective: the process, habit, or general action of cleaning
• прибрати = perfective: to clean up completely, to get it done

In this sentence, прибрати suggests I want to clean the room up before bed as a completed task.

Compare:

• Я хочу прибирати кімнату = I want to be cleaning / I want to clean rooms in general / I want to clean habitually
• Я хочу прибрати кімнату = I want to clean up the room (finish the job)

So прибрати sounds more natural here.

Because кімнату is the accusative singular form, and the room is the direct object of the verb прибрати.

The dictionary form is:

• кімната = room

But when it is the thing being cleaned, it changes:

• прибрати кімнату = to clean the room

For many feminine nouns ending in -а, the accusative singular ends in -у:

• книга → книгу
• машина → машину
• кімната → кімнату

Because the preposition перед normally requires the instrumental case.

The noun is:

• сон = sleep

Its instrumental singular form is:

• сном

So:

• перед сном = before sleep / before bed

This is a very common pattern:

• перед уроком = before the lesson
• перед роботою = before work
• перед сном = before sleep

Yes, literally it is before sleep, but in natural English it often means:

• before bed
• before going to sleep

It is a very normal, idiomatic way to say that something happens in the time right before sleeping.

Yes. Ukrainian often drops subject pronouns when they are already clear from the verb ending.

So both are possible:

• Я хочу прибрати кімнату перед сном
• Хочу прибрати кімнату перед сном

Since хочу already means I want, Я is not always necessary.

Including Я can add emphasis, contrast, or simply make the sentence feel a bit more explicit.

No. Ukrainian word order is fairly flexible. The sentence as written is neutral and natural:

• Я хочу прибрати кімнату перед сном.

But other orders are also possible, depending on emphasis:

• Перед сном я хочу прибрати кімнату. = Before bed, I want to clean the room.
• Кімнату я хочу прибрати перед сном. = It’s the room that I want to clean before bed.

So word order often helps show focus rather than strict grammar.

It can mean either, depending on context, but very often прибрати кімнату means tidy up / clean up the room.

It does not always imply deep cleaning. It can include things like:

• putting things away
• making the room neat
• doing some basic cleaning

If you want to be more specific, Ukrainian can use other verbs too:

• почистити = clean
• помити = wash
• попилососити = vacuum

But прибрати кімнату is a very common all-purpose phrase.

Because Ukrainian has no articles like a or the.

So кімнату could mean:

• a room
• the room

The exact meaning depends on context.

In this sentence, English usually says the room, because it sounds like a specific room the speaker has in mind. Ukrainian does not need a separate word for that.

You simply add не before хочу:

• Я не хочу прибрати кімнату перед сном. = I don’t want to clean the room before bed.

In everyday speech, many speakers might also say:

• Я не хочу прибирати кімнату перед сном.

Both are possible, but the aspect changes the nuance:

• не хочу прибрати = I don’t want to get the room cleaned up
• не хочу прибирати = I don’t want to be cleaning / don’t want to clean in general

Yes. Перед сном is very natural and common, but there are other ways depending on the exact meaning:

• перед сном = before sleep / before bed
• перед тим, як лягти спати = before going to bed
• до сну is much less natural here

So for this sentence, перед сном is probably the best everyday choice.