bameneun jamoseuro garaipgo baro jayo.

밤에 means at night. Adding 는 makes it 밤에는, which gives it a topic/contrast feeling.

So 밤에는 can mean:

• at night
• as for at night
• when it comes to nighttime

This often implies a contrast, even if it is not stated directly. For example, it can suggest something like:

• In the daytime I do other things, but at night I change into pajamas and sleep.

So:

• 밤에 = at night
• 밤에는 = at night / as for at night / at night, specifically

In this sentence, -으로 marks what you change into.

• 잠옷 = pajamas
• 잠옷으로 갈아입다 = to change into pajamas

A very natural way to think about it is:

• A로 갈아입다 = change into A

Examples:

• 운동복으로 갈아입어요. = I change into workout clothes.
• 정장으로 갈아입었어요. = I changed into a suit.

So 잠옷으로 does not mean with pajamas here. It means into pajamas.

-고 connects verbs, like and in English.

So:

• 갈아입고 = change clothes and...
• 바로 자요 = go right to sleep

Together:

• 갈아입고 바로 자요 = I change into pajamas and then go right to sleep.

This structure is very common in Korean:

• 씻고 자요. = I wash up and sleep.
• 숙제하고 놀아요. = I do homework and play.

Here, -고 simply links the first action to the next one in sequence.

갈아입다 means to change clothes or to change into different clothes.

It is made from:

• 갈다 = to change/replace
• 입다 = to wear

So the combined meaning is basically to change what you are wearing.

Common patterns:

• 옷을 갈아입다 = to change clothes
• 잠옷으로 갈아입다 = to change into pajamas
• 편한 옷으로 갈아입다 = to change into comfortable clothes

This verb is specifically about clothing, not changing in a general sense.

In Korean, the present tense often covers:

• general truths
• habits
• routines
• repeated actions

So 자요 can mean:

• I sleep
• I go to sleep
• I usually sleep
• I go to bed

In a sentence like this, it is very natural to interpret it as a routine:

• At night, I change into pajamas and go right to sleep.

Korean does not need a special form like I usually every time. Context often makes the habitual meaning clear.

바로 means right away, directly, or immediately.

So:

• 바로 자요 = go to sleep right away / go straight to sleep

It emphasizes that there is not much delay between changing into pajamas and sleeping.

Compare:

• 자요 = sleep / go to sleep
• 바로 자요 = go straight to sleep

So 바로 adds the idea of immediacy.

Yes. Korean often omits the subject when it is clear from context.

This sentence does not explicitly say:

• 저는 = I
• 그는 = he
• 아이는 = the child

But in context, the subject is understood.

So depending on the situation, this sentence could mean:

• I change into pajamas and go right to sleep at night.
• He changes into pajamas and goes right to sleep at night.
• The child changes into pajamas and goes right to sleep at night.

This is very normal in Korean.

The ending 자요 is in the polite informal style, often called the -아요/-어요 form.

Here:

• dictionary form: 자다 = to sleep
• polite form: 자요

Also:

• 갈아입다 would become 갈아입어요, but because it is followed by -고, it stays as 갈아입고

This style is very common in everyday Korean conversation. It is polite and natural in many situations.

Compare:

• 갈아입고 바로 자요. = polite
• 갈아입고 바로 자. = casual, plain speech
• 갈아입고 바로 잡니다. = more formal

Yes, but the meaning is structured a little differently.

Two common patterns are:

• 잠옷으로 갈아입고 = change into pajamas
• 잠옷을 갈아입고 = put on/change into pajamas

Both can be natural, but 잠옷으로 갈아입다 more clearly highlights the new clothing state you change into.

Compare:

• 옷을 갈아입다 = change clothes
• 잠옷으로 갈아입다 = change into pajamas

So the sentence you were given is perfectly natural and emphasizes the result: ending up in pajamas.

By itself, 밤에는 usually means at night or when nighttime comes. Depending on context, it can also sound habitual, like at night, as a rule.

So this sentence can be understood in two ways:

• a general habit: At night, I change into pajamas and go right to sleep.
• a description of what happens at nighttime in general

If someone wanted to be more explicit about every night, they could say:

• 매일 밤에는 = every night
• 밤마다 = every night / night after night

But the original sentence already sounds very natural as a description of a routine.

It is written 갈아입고, but in natural speech the pronunciation is closer to 가라입꼬.

A few helpful points:

• 갈아 flows together smoothly
• 입고 is often pronounced closer to 입꼬 because the ㄱ in 고 becomes tense after a final consonant sound

So learners often hear something like:

• 가라입꼬 바로 자요

You should still write it as 갈아입고, but it is useful to know that the spoken form may sound a bit different.

Yes. In this sentence, -고 naturally gives a sequence:

1. 잠옷으로 갈아입고 = change into pajamas
2. 바로 자요 = go right to sleep

Although -고 does not always strongly emphasize time order in every sentence, here the meaning is naturally sequential because the actions logically happen one after the other.

So the sentence strongly suggests:

• First I change into pajamas, then I immediately go to sleep.