من عادتي أن أقرأ قبل أن أنام.

Literally, من عادتي means something like from my habit or among my habits.

In natural English, though, it means:

• It is my habit to...
• I usually...
• As a habit, I...

The preposition من here is part of an idiomatic expression. It suggests that the action is one of the things that belong to your habits.

So:

• من عادتي أن أقرأ = It is my habit to read

Yes, you can. عادتي أن أقرأ قبل أن أنام is understandable and grammatical.

But there is a slight difference in feel:

• من عادتي أن أقرأ... = a very common way to say it is my habit to read...
• عادتي أن أقرأ... = more directly my habit is to read...

So both work, but من عادتي often sounds a bit more idiomatic and natural in this kind of sentence.

The أن introduces a verb phrase after the noun expression من عادتي.

So:

• أن أقرأ = to read / that I read

In Arabic grammar, أن + present-tense verb often functions like a verbal noun or infinitive-like expression.

So the structure is:

• من عادتي = it is my habit
• أن أقرأ = to read

Together:

• من عادتي أن أقرأ = It is my habit to read

Because after قبل when you want to follow it with a full verb clause, Arabic normally uses أن.

So:

• قبل أن أنام = before I sleep
• literally: before that I sleep

This is very common in MSA.

Compare:

• قبل النوم = before sleeping / before sleep
• قبل أن أنام = before I sleep

The first uses a noun, and the second uses a verb clause.

Yes. After this أن, the following present-tense verb is normally in the subjunctive.

So in fully vowelled Arabic, you would have:

• أن أقرأَ
• أن أنامَ

In normal unvowelled writing, this usually looks the same as the regular form, so learners often do not see the difference.

That is why the sentence is written:

• من عادتي أن أقرأ قبل أن أنام

even though grammatically the verbs after أن are subjunctive.

Because the verb itself already shows the subject.

In both verbs:

• أقرأ = I read
• أنام = I sleep

The prefix أ- marks first person singular.

So Arabic does not need أنا unless you want emphasis or contrast.

For example:

• أنا أقرأ قبل أن أنام = I read before I sleep
  This is more emphatic, like I read before I sleep.

But in your sentence, أنا is unnecessary.

It is mainly talking about a habitual action.

The clue is من عادتي = it is my habit.

So أقرأ here does not mean only I am reading now. It means:

• I usually read
• I tend to read
• Reading is part of my routine

So the sentence expresses a general repeated habit, not a one-time event.

Yes, absolutely. That is a very natural alternative.

Compare:

• من عادتي أن أقرأ قبل أن أنام = It is my habit to read before I sleep
• من عادتي أن أقرأ قبل النوم = It is my habit to read before sleep / before going to sleep

Both are good Arabic.

A small nuance:

• قبل أن أنام focuses on the clause before I sleep
• قبل النوم is a little more compact and noun-based

In many contexts, they are practically interchangeable.

Because نام is a weak verb, more specifically a hollow verb.

Its past form is:

• نامَ = he slept

But in the present/imperfect it changes pattern:

• ينامُ = he sleeps
• أنامُ = I sleep

So this is just the normal conjugation pattern of this verb. You have to learn it as:

• نامَ / ينامُ

Then for I sleep, you use:

• أنامُ

And after أن, in this sentence:

• أن أنامَ

A useful way to understand it is:

• من عادتي = a prepositional phrase meaning it is my habit
• أن أقرأ قبل أن أنام = a clause meaning to read before I sleep

So the whole sentence is basically:

• Reading before I sleep is one of my habits

In more advanced grammar terms, أن أقرأ قبل أن أنام is treated like a noun-like clause, often called a masdar mu'awwal (an interpreted verbal noun).

So Arabic is building the sentence out of:

• a phrase about habit
• plus a clause describing the habitual action

It is pronounced approximately as aqraʾu in the basic form, and in this sentence after أن it is grammatically aqraʾa if fully vowelled.

Important points:

• the first sound أ is a glottal stop + a
• ق is a deep q sound, not an English k
• the final ء is another glottal stop

So أقرأ is roughly:

• aq-ra-ʾ

Not:

• akra
• aqraa with no final stop

If you pause at the end of the word in normal speech, you may hear it simply as aqraʾ.

Yes, that is completely normal.

Here the first أن is the particle meaning something like to / that, and the second word أنام is the verb I sleep.

So:

• أن أنام = that I sleep / to sleep

Even though they look similar, they are doing different jobs:

• أن = particle
• أنام = verb

This kind of sequence is common in Arabic, and native speakers do not find it strange.