Antes de dormir, eu gosto de trancar a porta, desligar a televisão e cobrir as pernas com o cobertor.

Because antes normally takes the preposition de when it is followed by a verb in the infinitive.

So in Portuguese, antes de + infinitive is the standard pattern:

• antes de sair
• antes de comer
• antes de dormir

It works like before + -ing or before + verb in English, depending on how you think about it.

If you use a full clause instead, Portuguese changes the structure:

• antes de dormir = before sleeping / before going to sleep
• antes que eu durma = before I sleep

After a preposition like de, Portuguese usually uses the infinitive form of the verb.

So:

• antes de dormir
• depois de comer
• sem falar

That is why you do not see durmo, dorme, or another conjugated form here.

In this sentence, dormir is not the main action of the sentence. It is part of the time expression antes de dormir.

Because gostar is a verb that requires the preposition de.

So in Portuguese, you say:

• gostar de algo = to like something
• gostar de fazer algo = to like doing something

Examples:

• Eu gosto de café.
• Eu gosto de viajar.

English learners often want to say something like eu gosto trancar, but that is not correct. It must be eu gosto de trancar.

Yes, it could be left out.

Portuguese often omits subject pronouns because the verb ending already shows the subject:

• gosto already tells you it means I like

So both are correct:

• Antes de dormir, eu gosto de...
• Antes de dormir, gosto de...

Including eu can add a little emphasis or clarity, but it is not required here.

Because after gostar de, when the thing you like is an action, Portuguese uses the infinitive.

So:

• gosto de trancar
• gosto de desligar
• gosto de cobrir

This is similar to English I like to lock, I like to turn off, I like to cover, though in English I like locking is also common.

In Portuguese, once de is introduced by gosto de, it applies to the whole list of actions:

• gosto de trancar a porta, desligar a televisão e cobrir as pernas com o cobertor

Because one de is enough for the whole coordinated list.

So:

• gosto de trancar a porta, desligar a televisão e cobrir as pernas com o cobertor

is the natural structure.

Portuguese does this just like English:

• I like to lock the door, turn off the TV, and cover my legs...

You do not need:

• gosto de trancar..., de desligar..., e de cobrir...

Repeating de is possible in some contexts for emphasis or style, but it is not the normal choice here.

Portuguese uses definite articles much more often than English does.

In English, we often say:

• lock the door
• turn off the TV
• cover my legs with the blanket

Portuguese usually keeps the article:

• trancar a porta
• desligar a televisão
• cobrir as pernas com o cobertor

This is very normal. Even when English might omit an article or use a possessive, Portuguese often prefers the definite article.

With body parts, Portuguese often uses the definite article instead of a possessive when the owner is obvious.

So Portuguese commonly says:

• lavei as mãos = I washed my hands
• machuquei o braço = I hurt my arm
• cobrir as pernas = cover my legs / the legs

Since the sentence is about what I do before sleeping, it is naturally understood that these are my legs.

You could say minhas pernas, but it sounds more explicit than necessary.

This is an important vocabulary difference.

• fechar a porta = to close the door
• trancar a porta = to lock the door

So trancar is stronger and more specific. It implies using the lock, not just pushing the door shut.

If the sentence had fechar a porta, the meaning would change.

Yes, absolutely.

Both are common in Brazilian Portuguese:

• desligar a televisão
• desligar a TV

Televisão is the full word, and TV is the everyday shorter version. In speech, many Brazilians would probably prefer TV in casual conversation.

So this sentence is correct and natural, but a more colloquial version could be:

• Antes de dormir, eu gosto de trancar a porta, desligar a TV e...

Here, com means with, showing the thing used to do the covering: the blanket.

So the structure is:

• cobrir [thing being covered] com [thing used to cover it]

In this case:

• as pernas = what is being covered
• o cobertor = what is used to cover them

That is why com is the natural preposition here.

Both are possible, but they emphasize slightly different things.

• cobrir as pernas com o cobertor focuses specifically on the legs
• me cobrir com o cobertor means cover myself with the blanket

If the person really means only the legs, the original sentence is fine.

If the idea is more general, many people might naturally say:

• me cobrir com o cobertor

So the original is grammatical and understandable, but me cobrir com o cobertor may sound more everyday if the whole body is meant.

It separates the introductory time expression from the main clause.

So the sentence has this structure:

• Antes de dormir, = before going to sleep
• eu gosto de... = main statement

This comma is very normal in writing and helps readability. You may sometimes see short introductory phrases without a comma, but here the comma is standard and natural.

The sentence follows a very normal Portuguese order:

• time expression first: Antes de dormir
• subject: eu
• main verb phrase: gosto de
• list of actions: trancar..., desligar..., e cobrir...

You could omit eu, but otherwise this order is very natural. Portuguese does allow some flexibility, but this version sounds straightforward and standard.

Yes, it works perfectly in Brazilian Portuguese, and it would also be understood in European Portuguese.

Nothing in the sentence is unusually regional. The only thing that might vary in everyday style is word choice:

• televisão vs TV
• cobrir as pernas com o cobertor vs me cobrir com o cobertor

But the grammar is standard and widely acceptable in Brazil.