De noche, me gusta leer en mi cuarto.

Because gustar works differently from to like in English.

In Spanish, gustar literally works more like to be pleasing to. So:

• Me gusta leer = Reading is pleasing to me
• not I like reading in the English sentence structure

Here:

• me = to me
• gusta = is pleasing
• leer = to read

So me gusta leer is the normal way to say I like reading.

Because the thing being liked here is the infinitive leer, and an infinitive counts as a singular idea in Spanish.

So:

• Me gusta leer = I like reading
• Me gusta nadar = I like swimming
• Me gusta cocinar = I like cooking

But if you like plural nouns, then you use gustan:

• Me gustan los libros = I like books

So in me gusta leer, the verb is singular because leer is treated as one activity.

De noche means at night or during the night.

It is a common time expression in Spanish, similar to:

• de día = in the daytime / by day
• de noche = at night / by night

In this sentence, De noche sets the time frame for the whole statement:

• At night, I like to read in my room

In Spain, por la noche is also very common and often sounds slightly more natural in everyday speech, but de noche is completely correct.

Both can mean at night, but they are used a little differently.

• por la noche is very common for in the evening / at night
• de noche often has a slightly more general or descriptive feel, like at night as a time period

For this sentence:

• De noche, me gusta leer en mi cuarto
• Por la noche, me gusta leer en mi cuarto

Both are correct.

In Spain, por la noche is often the most everyday choice in conversation, but de noche is still natural and common.

Because Spanish often leaves out subject pronouns when they are not needed.

The sentence says:

• me gusta = I like / literally it pleases me

Even without yo, it is already clear who is involved because of me.

Spanish usually avoids pronouns like yo, tú, él, etc. unless:

• you want emphasis
• you want contrast
• the meaning would otherwise be unclear

So:

• Me gusta leer en mi cuarto = normal
• Yo, de noche, me gusta leer... = unusual here
• A mí me gusta leer... = possible for emphasis

Because after gustar, Spanish often uses an infinitive to talk about liking an activity.

Examples:

• Me gusta leer = I like reading / I like to read
• Me gusta correr = I like running / I like to run
• Me gusta estudiar = I like studying / I like to study

So leer is not being conjugated because it is functioning as the activity that is liked.

Grammatically, leer is the infinitive to read, but in English we often translate it as either:

• to read
• reading

So:

• Me gusta leer = I like to read
• Me gusta leer = I like reading

Both are good translations in English.

Yes. Cuarto can mean different things depending on context.

Here, mi cuarto means my room.

But cuarto can also mean:

• fourth: el cuarto libro = the fourth book
• a quarter: un cuarto de hora = a quarter of an hour

In this sentence, because it comes after mi and after en, the meaning is clearly room:

• en mi cuarto = in my room

They are similar, but not always exactly the same.

In Spain:

• cuarto often means room
• habitación also means room, and can sound a bit more neutral or formal
• dormitorio specifically means bedroom

So mi cuarto here most naturally means my room, probably my bedroom in context.

A learner should know that cuarto is very common in everyday Spanish, especially in some regions, but habitación and dormitorio are also useful words.

Because en means in, and the sentence describes location, not movement.

• en mi cuarto = in my room
• a mi cuarto = to my room

This sentence says where the reading happens:

• I like to read in my room

If it were about movement, then a would be used:

• Voy a mi cuarto = I go to my room

So en is correct because the room is the place where the action happens.

Me is an indirect object pronoun meaning to me.

With gustar, the person who experiences the liking is expressed as an indirect object:

• me = to me
• te = to you
• le = to him/her/you
• nos = to us
• os = to you all
• les = to them/you all

So:

• Me gusta leer = Reading is pleasing to me

This is one of the most important things to understand about gustar.

Yes. That is correct.

• Me gusta leer en mi cuarto = neutral, normal
• A mí me gusta leer en mi cuarto = adds emphasis or contrast

For example:

• A mí me gusta leer en mi cuarto, pero a mi hermano le gusta leer en el salón.

The a mí is optional here because me already tells you who is meant.

Because De noche is an introductory time expression placed at the beginning of the sentence.

The comma helps separate that opening phrase from the main clause:

• De noche, me gusta leer en mi cuarto.

In Spanish, commas after short introductory phrases are sometimes a matter of style, but this punctuation is perfectly natural and helps readability.

You may also see:

• De noche me gusta leer en mi cuarto.

Both are possible.

Yes. Spanish word order is often flexible, especially with time and place phrases.

These are all possible:

• De noche, me gusta leer en mi cuarto.
• Me gusta leer en mi cuarto de noche.
• En mi cuarto, me gusta leer de noche.

But they do not all sound equally natural in every context.

The original sentence is very clear and natural because it presents:

1. the time: De noche
2. the opinion: me gusta
3. the activity: leer
4. the place: en mi cuarto

That makes it a very learner-friendly word order.

Yes, but the meaning becomes stronger.

• me gusta = I like
• me encanta = I love

So:

• De noche, me gusta leer en mi cuarto = At night, I like reading in my room
• De noche, me encanta leer en mi cuarto = At night, I love reading in my room

Both are correct; they just express different levels of enthusiasm.