Antes de dormir, quiero ordenar mis apuntes en la carpeta azul.

Because after antes de, Spanish normally uses an infinitive when the subject stays the same.

• antes de dormir = before sleeping / before going to sleep
• duermo is a conjugated form = I sleep, so it does not fit after antes de here.

A useful pattern is:

• antes de + infinitive

Examples:

• Antes de salir, apago la luz.
• Antes de comer, me lavo las manos.

If the subject changes, Spanish often uses antes de que + subjunctive instead:

• Antes de que llegues, quiero terminar esto.

Because dormir on its own already means to sleep or to go to sleep, and that is enough here.

• antes de dormir = before sleeping / before going to sleep

Spanish sometimes uses dormirse to emphasise falling asleep:

• antes de dormirme = before I fall asleep

So:

• dormir = to sleep
• dormirse = to fall asleep / to go to sleep

In this sentence, dormir is the most neutral and natural choice.

Because the subject of both verbs is the same: I want and I will organise.

When the same person does both actions, Spanish usually uses:

• querer + infinitive

So:

• Quiero ordenar mis apuntes = I want to organise my notes

You use quiero que + subjunctive when someone else does the second action:

• Quiero que ordenes tus apuntes = I want you to organise your notes

Here ordenar means to organise, to sort, or to put in order.

It does not mean to order in the restaurant/shop sense here.

Possible meanings of ordenar:

• organise
• sort
• arrange
• put in order

With apuntes, it suggests something like:

• putting the notes in the right place
• sorting them by subject or date
• tidying them up

A near synonym is organizar, but ordenar often gives a stronger idea of putting things neatly in order.

Apuntes usually means notes, especially class notes, study notes, or notes you have written down for learning.

Common contexts:

• school
• university
• revision
• lectures

So mis apuntes would usually be:

• my class notes
• my study notes

It is a very common word in Spain for academic notes.

Because in Spanish, a possessive adjective like mi, mis, tu, tus, su, sus normally replaces the article.

So you say:

• mis apuntes not
• los mis apuntes

Compare:

• los apuntes = the notes
• mis apuntes = my notes

This is a basic rule in Spanish:

• article + noun
• or possessive + noun

but not usually both together in this structure.

Here carpeta most naturally means folder, binder, or a place where papers are kept.

In modern Spanish, carpeta can also mean a computer folder, depending on context. But in this sentence, because of apuntes, a physical folder is probably the most natural interpretation.

So:

• carpeta = folder
• possibly binder, depending on the exact object
• sometimes computer folder in digital contexts

Context decides the best translation.

Here en means something like in.

• ordenar mis apuntes en la carpeta azul suggests putting or arranging the notes in that blue folder

Spanish en can cover meanings that English sometimes expresses with in, on, or even into, depending on context.

In this sentence, the idea is location/result:

• the notes end up in the blue folder

Because in Spanish, adjectives usually come after the noun.

So:

• la carpeta azul = the blue folder

This is the normal word order:

• noun + adjective

Examples:

• el coche rojo
• la mesa grande
• los apuntes importantes

Sometimes adjectives can go before the noun, but that often changes the tone or meaning. Here, carpeta azul is the straightforward normal order.

Because azul is one of the adjectives that does not change form for masculine and feminine in the singular.

So you get:

• el libro azul
• la carpeta azul

But in the plural it does change:

• los libros azules
• las carpetas azules

So azul is:

• singular: azul
• plural: azules

It is very natural, and often recommended, because Antes de dormir is an introductory phrase placed at the beginning of the sentence.

So:

• Antes de dormir, quiero ordenar mis apuntes...

The comma helps readability and reflects a small pause.

In informal writing, some people may omit it, but using the comma here is a good standard choice.

Yes, depending on context, that can be a very natural English translation.

Literally, it is:

• before sleeping
• before going to sleep

But in natural English, people often say:

• before going to bed

That said, going to bed and going to sleep are not always exactly the same. Spanish dormir refers more directly to sleeping, but in everyday use the English translation may vary.

Yes, you probably could:

• Antes de dormir, quiero organizar mis apuntes en la carpeta azul.

That is also correct and natural.

The difference is small:

• ordenar = put in order, tidy, sort neatly
• organizar = organise, arrange systematically

With apuntes, both work well. Ordenar may sound a bit more like tidying/sorting them properly, while organizar can sound a bit more general or systematic.

Yes, it sounds natural and correct in Spanish from Spain.

Everything in it is standard:

• Antes de dormir is a common time expression
• quiero + infinitive is normal
• apuntes is very common in Spain for study notes
• carpeta azul is completely natural

So this is a good everyday sentence for Peninsular Spanish.