Saya tidur lebih awal malam ini supaya besok tidak keburu mengantuk di kelas, karena tadi malam saya hampir begadang.

In Indonesian, tidur can refer both to sleeping and to going to bed, depending on context.

So:

• Saya tidur lebih awal malam ini can naturally mean I’m going to bed earlier tonight
• It can also be understood as I’m sleeping earlier tonight

In English we often separate go to bed and sleep, but Indonesian is looser here. The time phrase malam ini and the idea of doing it lebih awal make go to bed earlier tonight the most natural interpretation.

Lebih awal means earlier in time.

• awal = early
• lebih awal = earlier

This is the normal choice when talking about doing something at an earlier time than usual.

Lebih cepat literally means faster or more quickly, and although it can sometimes relate to time, it is less natural here because going to bed is not really about speed, but about starting earlier on the clock.

So:

• tidur lebih awal = go to sleep earlier
• tidur lebih cepat = would sound more like sleeping faster, which is not the intended idea

This is a very common point of confusion.

• malam ini = tonight / this evening
• tadi malam = last night

So in the sentence:

• malam ini refers to the night that is coming or currently happening
• tadi malam refers to the previous night

That is why both can appear in the same sentence:

• Saya tidur lebih awal malam ini = I’m going to bed early tonight
• karena tadi malam saya hampir begadang = because last night I almost stayed up all night

Supaya means so that / in order that. It introduces a purpose.

In this sentence:

• supaya besok tidak keburu mengantuk di kelas
• so that tomorrow I won’t end up getting sleepy in class too soon

Yes, you can usually replace supaya with agar:

• Saya tidur lebih awal malam ini agar besok tidak keburu mengantuk di kelas.

Both are correct and natural. In many situations:

• supaya feels a bit more conversational
• agar can feel slightly more formal or neat

But the difference is small.

Keburu is a tricky word because it often adds the idea of already ending up doing something before you wanted, or doing something too soon / before it’s ideal.

In this sentence:

• tidak keburu mengantuk di kelas

the idea is roughly:

• so I won’t get sleepy in class too soon
• so I won’t already be sleepy in class
• so I won’t end up getting sleepy in class before I can manage it

It adds a nuance that plain tidak mengantuk does not fully express.

Compare:

• tidak mengantuk di kelas = not sleepy in class
• tidak keburu mengantuk di kelas = not already / not too soon become sleepy in class

So keburu gives a sense of prematurely or before I want that to happen.

It behaves a lot like an adjective in meaning, because it means sleepy / drowsy, but in Indonesian it is often treated as a verb-like predicate too.

Examples:

• Saya mengantuk = I’m sleepy
• Dia mulai mengantuk = He/She is starting to get sleepy

So you do not need a separate word meaning to be. Indonesian commonly allows words like mengantuk to function directly as the predicate.

In this sentence, mengantuk means to feel sleepy / become sleepy.

Because the sentence is talking about location, not movement.

• di kelas = in class / in the classroom
• ke kelas = to class / to the classroom

Here the idea is becoming sleepy while in class, so di kelas is correct.

Compare:

• Saya mengantuk di kelas = I get sleepy in class
• Saya pergi ke kelas = I go to class

Begadang means to stay up late, often with the nuance of staying awake until very late at night, sometimes even close to or through dawn.

It is stronger than just sleeping late. It suggests deliberately or effectively remaining awake deep into the night.

Examples:

• Saya begadang karena tugas = I stayed up late because of assignments
• Jangan sering begadang = Don’t stay up late too often

In your sentence:

• hampir begadang = almost stayed up all night / almost stayed up very late

Hampir means almost / nearly.

So:

• saya hampir begadang = I almost stayed up late
• or more naturally in English here: I almost stayed up all night

It comes before the verb it modifies.

Other examples:

• Saya hampir terlambat = I was almost late
• Dia hampir jatuh = He/She almost fell

So the structure is very straightforward:

• hampir + verb/state

Yes, it can be omitted, but repeating it is perfectly normal.

The sentence has:

• ... karena tadi malam saya hampir begadang

The repeated saya makes the clause clear and complete. Indonesian often repeats the subject in a new clause, especially after connectors like karena.

You could say:

• Saya tidur lebih awal malam ini supaya besok tidak keburu mengantuk di kelas, karena tadi malam hampir begadang.

People may understand it from context, but this version sounds less complete and a bit less natural to many speakers because hampir begadang feels like it wants an explicit subject.

So the repetition is not awkward; it is normal Indonesian style.

Indonesian usually does not change the verb form for tense the way English does. Instead, time is shown through context and time expressions.

In this sentence, time is made clear by:

• malam ini = tonight
• besok = tomorrow
• tadi malam = last night

So even though tidur, mengantuk, and begadang do not change form, the timeline is easy to understand.

That is very typical in Indonesian. Time words do much of the work that verb tense does in English.

Yes, it is understandable and basically natural. It has a clear flow:

• action now/tonight
• purpose for tomorrow
• reason based on last night

That said, tidak keburu mengantuk is a slightly nuanced phrasing, and some speakers might choose a simpler version such as:

• Saya tidur lebih awal malam ini supaya besok tidak mengantuk di kelas, karena tadi malam saya hampir begadang.

This version is a bit more straightforward.

The original sentence is still good, but keburu adds a specific nuance of getting sleepy too soon / already becoming sleepy, which may be why it was chosen.

A literal translation like because last night I almost stayed up late is possible, but it can sound weak or odd in English.

That is because begadang often carries a stronger sense than just stay up late. It can imply:

• staying up extremely late
• nearly pulling an all-nighter
• being awake much longer than normal

So depending on context, English may naturally render it as:

• because I almost stayed up all night last night
• because I nearly pulled an all-nighter last night

This is not because the Indonesian is different in grammar, but because begadang often has a stronger practical meaning than a plain English stay up late.