Jeg er vant til at gå i seng tidligt.

In this sentence, vant is functioning like an adjective, and være vant til is a fixed expression meaning to be used to.

• jeg er vant til ... = I am used to ...
• jeg bliver vant til ... = I get used to ...

So:

• er shows a state you already have
• bliver shows a change into that state

That is why Jeg er vant til at gå i seng tidligt describes an existing habit, not the process of developing one.

Vant is the past participle of vænne, but in modern Danish it is very often used adjectivally in the expression være vant til.

So even though it historically comes from a verb, learners should usually treat vant til as a common phrase:

• Jeg er vant til kaffe.
• Hun er vant til kulde.
• Vi er vant til at arbejde sent.

In other words, it behaves much like an adjective phrase meaning accustomed to / used to.

Because vant normally goes together with til. The combination vant til is fixed.

You can think of it as:

• vant til + noun
• vant til + at + infinitive

Examples:

• Jeg er vant til støj. = used to noise
• Jeg er vant til at stå tidligt op. = used to getting up early

Even though English also uses to in used to, the grammar after it is different in Danish.

Because after vant til, if the next idea is a verb, Danish normally uses at + infinitive.

So:

• vant til kaffe = used to coffee
• vant til at drikke kaffe = used to drinking coffee

This is an important difference from English. In English, after used to, you often use the -ing form:

• used to going

But in Danish, you use:

• vant til at gå

So at gå is the infinitive structure required here.

Because gå i seng means to go to bed, while sove means to sleep.

These are related, but not the same:

• gå i seng = the action of going to bed
• sove = the action of sleeping

So:

• Jeg er vant til at gå i seng tidligt = I’m used to going to bed early
• Jeg er vant til at sove tidligt would sound odd, because sleep early is not usually the intended idea

Danish uses gå i seng very naturally in this context, just like English uses go to bed.

Because gå i seng is an idiomatic expression in Danish. You simply learn it as a whole phrase.

• gå i seng = go to bed
• være i seng = be in bed

Danish often uses prepositions in ways that do not match English word-for-word. So even though English has to bed, Danish uses i seng.

This is something best memorized as a set expression rather than translated piece by piece.

Tidligt is an adverb meaning early.

It comes from the adjective tidlig:

• en tidlig morgen = an early morning

When Danish uses an adjective adverbially, it often adds -t:

• hurtig → hurtigt
• langsom → langsomt
• tidlig → tidligt

Here, tidligt describes the verb phrase gå i seng, so it tells you how/when the action happens: early.

It would normally go after the finite verb:

• Jeg er ikke vant til at gå i seng tidligt.

This follows normal Danish word order in main clauses:

• subject: Jeg
• finite verb: er
• sentence adverb: ikke

So ikke comes after er, not before it.

Yes. That is very common.

With a noun:

• Jeg er vant til kaffe.
• Hun er vant til dansk vintervejr.

With a verb:

• Jeg er vant til at gå i seng tidligt.
• Vi er vant til at arbejde hårdt.

So the pattern is:

• vant til + noun
• vant til + at + infinitive

This is a very useful structure to learn.

Yes, that is grammatically possible, but it is less direct and less everyday than Jeg er vant til at gå i seng tidligt.

The original sentence sounds very natural because it describes the habit as an action. Danish often prefers the verbal structure when talking about routines.

Compare:

• Jeg er vant til at gå i seng tidligt. = very natural
• Jeg er vant til tidlige sengetider. = possible, but more noun-based and slightly more formal or abstract

So the original version is the one most learners should aim for.

Because tidligt naturally comes at the end here as an adverb modifying the action gå i seng.

That is the most neutral word order:

• Jeg er vant til at gå i seng tidligt.

You can move adverbs around in Danish for emphasis, but the neutral everyday position is usually after the infinitive phrase or near the end.

For example, Jeg er vant til tidligt at gå i seng is possible, but it sounds more formal or stylistically marked.

So for normal conversation, the original order is best.

Not usually. In natural spoken Danish, jeg is often reduced.

Depending on accent and speaking style, it may sound more like:

• yai
• ya
• sometimes something even weaker in fast speech

Learners often hear a difference between careful textbook pronunciation and everyday spoken Danish. That is normal.

So if you do not hear a very clear full pronunciation of jeg, do not worry — native speakers often reduce it.

The most straightforward past version is:

• Jeg var vant til at gå i seng tidligt.

That means I was used to going to bed early.

If you want to express becoming used to it, you would say:

• Jeg blev vant til at gå i seng tidligt.

So the contrast is:

• var vant til = was used to
• blev vant til = got used to

This is a very useful distinction in Danish.