Je moet eerder naar bed gaan als je steeds moe bent.

Because the sentence has two clauses, and each clause has its own subject:

• Je moet eerder naar bed gaan = the main clause
• als je steeds moe bent = the subordinate clause

In both clauses, the subject is je = you.

Moet is the singular form of the verb moeten for je:

• ik moet
• jij/je moet
• hij/zij moet
• wij moeten
• jullie moeten
• zij moeten

So with je, Dutch uses moet.

Here, eerder means earlier.

So eerder naar bed gaan means go to bed earlier.

Be careful: eerder can also mean rather or sooner in other contexts, but in this sentence it clearly refers to time.

Naar bed gaan is a very common Dutch expression meaning to go to bed.

Literally:

• naar = to
• bed = bed
• gaan = go

Dutch often uses this fixed expression where English also says go to bed. It does not necessarily mean you immediately fall asleep; it means you go to bed.

Because moeten is a modal verb, and in Dutch modal verbs usually work with another verb in the infinitive, which goes to the end of the clause.

So:

• Je moet ... gaan

And the full infinitive phrase is:

• eerder naar bed gaan

This is very normal Dutch word order.

Compare:

• Ik wil Nederlands leren.
• Zij kan morgen komen.
• Je moet eerder naar bed gaan.

Here als means if.

The sentence gives a condition:

• if you are always tired

That is why als is used.

Wanneer usually means when, and it sounds more time-based than conditional.

So in this sentence:

• als = the natural choice for if

Because als introduces a subordinate clause, and in Dutch subordinate clauses the conjugated verb usually goes to the end.

So:

• main clause: je bent steeds moe
• subordinate clause: als je steeds moe bent

That final bent is a classic Dutch subordinate-clause pattern.

Because the subject is je.

With zijn, the forms are:

• ik ben
• jij/je bent
• hij/zij is

So je bent is correct.

Steeds here means constantly, all the time, or repeatedly.

So steeds moe means something like:

• always tired
• constantly tired
• tired again and again

In everyday English, the translation is often just always tired, even though altijd is the more direct word for always.

Because moe is being used as a predicate adjective, after the verb zijn.

In Dutch, predicate adjectives normally do not take an extra ending:

• Ik ben moe.
• Hij is ziek.
• Wij zijn klaar.

You usually add -e only when the adjective comes before a noun:

• de moeë man is not standard here
• but for normal adjectives: de zieke man, het grote huis

So in this sentence, je bent moe is correct because moe comes after bent.

Yes, je is the informal you.

You could make it formal by using u:

• U moet eerder naar bed gaan als u steeds moe bent.

That means the same thing, but in a more formal or polite way.

Sometimes yes, but in this sentence Je moet eerder naar bed gaan is the most natural order.

Dutch often places adverbs like eerder before the part they modify. Here it modifies naar bed gaan, so putting it before that phrase sounds very natural.

A learner should treat moet eerder naar bed gaan as a very normal pattern.

It can feel like either, depending on context.

Literally, moeten often means must or have to, which sounds strong. But in everyday speech, it can also be used for firm advice:

• Je moet eerder naar bed gaan = You should really go to bed earlier

So the exact force depends on tone and situation. In many contexts, this sounds more like practical advice than a strict command.