Saya meletakkan dompet di atas meja sebelum tidur.

Meletakkan means to place / to put something somewhere.

It comes from the root letak, which is related to position or placement. With the affixes me- ... -kan, it becomes an active transitive verb: to place something.

So in this sentence:

• Saya = I
• meletakkan = put / placed
• dompet = wallet

A native speaker could also say menaruh dompet or, more casually, taruh dompet.
Meletakkan sounds a bit more formal or deliberate than taruh.

In this sentence, me- ... -kan helps form an active verb that takes an object.

Here, the object is dompet.

So:

• letak relates to position/place
• meletakkan = to put/place something

This pattern often makes a verb feel more clearly transitive, meaning it acts on something.

That is why meletakkan dompet is natural: the action is being done to the wallet.

Di atas meja means on top of the table or simply on the table.

• di = at/in/on
• atas = top/upper part
• meja = table

So di atas meja literally means at the top of the table.

Using pada meja would not be the normal way to say on the table here.
For physical location, di is the usual choice.

Because here di is a preposition, not a prefix.

In Indonesian:

• di atas meja = on the table → di is separate
• diletakkan = is placed / was placed → di- is a prefix and is attached

This is a very common point of confusion for learners.

A simple rule:

• di
  • place/location = usually written separately
• di- for passive verbs = written together

So di atas is correct because it expresses location.

Usually, in everyday use, di atas meja is understood as on the table.

Literally, though, it can also mean above the table. Context usually makes the intended meaning clear.

In this sentence, most people will naturally understand it as the wallet is placed on the table, not floating above it.

Because dompet by itself just means wallet. Indonesian often leaves out ownership if it is not important or already understood from context.

So:

• dompet = wallet
• dompet saya = my wallet

If you want to be explicit, you can say:

Saya meletakkan dompet saya di atas meja sebelum tidur.

But the shorter version is completely natural if the listener already knows which wallet is meant, or if the exact ownership is not the focus.

Both are possible.

Sebelum tidur is a shorter, very natural way to say before sleeping / before I sleep / before going to sleep.

Indonesian often omits the subject in a subordinate clause when it is already clear from context. Since the main subject is saya, listeners naturally understand that tidur also refers to I sleep.

So:

• sebelum tidur = before sleeping / before going to sleep
• sebelum saya tidur = before I sleep

The longer version is more explicit, but the shorter version is very common.

Indonesian verbs usually do not change form for tense.

So meletakkan can refer to:

• past: I put / I placed
• present/habitual: I put
• future: I will put

The time is normally understood from context or from time words.

In this sentence, sebelum tidur gives some time context, but it still does not force a single English tense by itself. Depending on the situation, the sentence could describe:

• a routine: I put my wallet on the table before sleeping
• a past event: I put the wallet on the table before going to bed
• a future plan: I’ll put the wallet on the table before sleeping

The sentence follows a very common Indonesian order:

Subject + Verb + Object + Place + Time

So:

• Saya = subject
• meletakkan = verb
• dompet = object
• di atas meja = place
• sebelum tidur = time

This is a very natural order.

However, Indonesian is somewhat flexible. You could also say:

Sebelum tidur, saya meletakkan dompet di atas meja.

That puts more focus on the time phrase before sleeping.

Yes, very often.

For example:

Saya taruh dompet di atas meja sebelum tidur.

That sounds more casual and conversational.

Compare them:

• meletakkan = more formal or careful
• menaruh = neutral
• taruh = casual, everyday speech

All are understandable and common, but meletakkan is a good standard verb for learners to know.

Indonesian does not have articles like a, an, and the in the same way English does.

So:

• dompet can mean a wallet or the wallet
• meja can mean a table or the table

The exact meaning comes from context.

That is why di atas meja can naturally mean on the table, even though there is no separate word for the.

Yes. In this kind of sentence, tidur often has the practical sense of go to sleep / go to bed / sleep depending on context.

So sebelum tidur can be understood as:

• before sleeping
• before going to sleep
• before bed

English makes finer distinctions here, but Indonesian often uses the same simple verb and lets context do the rest.