Likevel sovner jeg raskt når alt er gjort, fordi det hjelper å vite at vi klarte alt sammen.

Likevel means nevertheless, still, or even so. It usually connects the sentence to something said before, showing contrast.

So the feeling is something like: there may be stress, tiredness, or a lot to do, but even so the speaker falls asleep quickly.

Allikevel is also used and means basically the same thing. For a learner, likevel is a very safe and common choice.

This is because of the Norwegian V2 rule: in a main clause, the finite verb normally comes in second position.

Here, Likevel is placed first. That means the verb sovner must come second, and the subject jeg comes after it:

• Jeg sovner raskt.
• Likevel sovner jeg raskt.

This is very common in Norwegian when a sentence starts with an adverb or other element.

Because å sovne and å sove are not the same:

• å sovne = to fall asleep
• å sove = to sleep

So:

• Jeg sovner raskt = I fall asleep quickly
• Jeg sover godt = I sleep well

In this sentence, the speaker is talking about the moment of falling asleep, so sovner is the correct verb.

Here raskt is being used adverbially, meaning quickly. It modifies the verb sovner.

The adjective is rask = fast/quick.
The adverbial form is often raskt.

So:

• en rask person = a quick person
• hun løper raskt = she runs quickly

In your sentence:

• sovner raskt = falls asleep quickly

Here når most naturally means when or once.

• når alt er gjort = when everything is done / once everything is done

The sentence is describing the point at which the speaker can relax and fall asleep.

A useful comparison is:

• når is often used for present/future or repeated situations
• da is often used for a specific event in the past

So når alt er gjort is the natural choice here.

Because alt er gjort focuses on the resulting state: everything is done.

• alt er gjort = everything is done
• vi har gjort alt = we have done everything

Both are possible in Norwegian, but they emphasize different things:

• alt er gjort focuses on the situation now
• vi har gjort alt focuses more on who did it

In this sentence, the important idea is that all the tasks are finished, not mainly who finished them.

Gjort is the past participle of gjøre.

So er gjort is a common Norwegian construction meaning something like:

• is done
• has been done

It can feel a bit like a passive or resultative expression. The key idea is that the action has been completed and the result now exists.

Examples:

• Jobben er gjort = The job is done
• Alt er gjort = Everything is done

This det is a dummy subject or formal subject. Norwegian often uses det in sentences like:

• Det er viktig å øve = It is important to practice
• Det er fint å være ferdig = It is nice to be finished
• Det hjelper å vite = It helps to know

So det does not refer to a specific thing. It is just part of a very common sentence pattern.

The real content comes after it:

• å vite at vi klarte alt sammen

Klarte is the past tense of å klare, which often means to manage, to succeed in, or to get through.

So vi klarte alt sammen means we managed all of it or we got everything done.

The past tense is natural because the speaker is looking back on something already completed. The tasks are finished, and now it helps to know that they succeeded.

In English, you might sometimes expect a present perfect idea, but Norwegian often uses the simple past naturally in this kind of context.

Here alt sammen means all of it, the whole thing, or everything altogether.

Even though sammen often means together, in this expression it is part of a fixed phrase:

• alt sammen = all of it
• det hele = the whole thing

So in this sentence:

• vi klarte alt sammen = we managed all of it

It does not mainly mean that we did it together, even though that idea might fit the context. The phrase is focusing on the total amount: the whole lot.

Because at introduces a subordinate clause.

In a main clause, Norwegian usually follows the V2 rule:

• Likevel sovner jeg raskt

But in a subordinate clause, the subject usually comes before the finite verb:

• at vi klarte alt sammen
• når alt er gjort
• fordi det hjelper å vite ...

So this contrast is very important:

• main clause: often verb in second position
• subordinate clause: subject before verb

That is why vi klarte is correct after at.