Det blir värre när jag inte sover.

In this sentence, det is a dummy subject. It does not point to a specific thing like it often does in English.

Swedish often uses det in general statements such as:

• Det är kallt. = It is cold.
• Det blir svårt. = It becomes difficult.

So in Det blir värre, det means something like it in English it gets worse. The exact thing that gets worse is understood from context.

Blir is the present tense of bli, which means become, get, or sometimes turn.

So:

• Det är värre = It is worse.
• Det blir värre = It gets worse / It becomes worse.

This sentence focuses on a change of state: things become worse when the speaker does not sleep.

Värre is the comparative form of dålig in the sense of bad/worse, or more directly the comparative form used where English has worse.

The pattern is:

• positive: dålig / sometimes illa depending on meaning
• comparative: värre
• superlative: värst

So värre means worse, not bad.

När usually means when.

In this sentence, när jag inte sover means when I don’t sleep.

It introduces the time or situation in which the main clause is true. In natural English, this can often sound like when or whenever.

So the sentence can suggest a repeated pattern:

• It gets worse when I don’t sleep.
• It gets worse whenever I don’t sleep.

Usually, no, not if you mean a real repeated situation.

• när = when
• om = if / whether

So:

• Det blir värre när jag inte sover. = It gets worse when I don’t sleep.
• Det blir värre om jag inte sover. = It will get worse if I don’t sleep.

The second version sounds more conditional and more like a possibility or warning. The original sentence sounds more like a known pattern or fact.

Because när jag inte sover is a subordinate clause.

In Swedish, word order changes in subordinate clauses. A very important rule is:

• In a main clause, the finite verb usually comes before inte.
• In a subordinate clause, inte usually comes before the finite verb.

Compare:

• Main clause: Jag sover inte. = I do not sleep.
• Subordinate clause: ... när jag inte sover. = ... when I do not sleep.

This is one of the most important word-order patterns in Swedish.

The sentence has two parts:

• Det blir värre = main clause
• när jag inte sover = subordinate clause

The subordinate clause begins with när. Words like när, att, om, eftersom, and som often introduce subordinate clauses in Swedish.

This matters because subordinate clauses have different word order, especially with inte.

Sover is the present tense of sova = to sleep.

Swedish often uses the present tense for things that are generally true, habitual, or repeatedly happen, just like English does:

• Jag mår bättre när jag tränar. = I feel better when I exercise.
• Det blir värre när jag inte sover. = It gets worse when I don’t sleep.

So the sentence is not just about one specific night; it can describe a general pattern.

Yes, very often that is how it is understood in real life.

Literally, jag inte sover means I do not sleep, but depending on context it can be used more loosely to mean:

• I don’t sleep well
• I don’t get enough sleep
• I haven’t been sleeping

If someone says Det blir värre när jag inte sover, they often mean that lack of sleep makes something worse, not necessarily that they stay awake all night every time.

Sometimes yes, but värre is the more natural choice in many contexts.

Both sämre and värre can translate as worse, but they are not always used in exactly the same way.

A simple way to think about it:

• sämre often relates to less good
• värre often relates to more bad / more serious / more unpleasant

In a sentence like this, especially about symptoms, pain, stress, or a problem getting more severe, värre sounds very natural.

It can be understood as a general present truth.

Swedish present tense often covers:

• what is happening now
• what usually happens
• general facts

So Det blir värre när jag inte sover most naturally means something like:

• This is what usually happens.
• Lack of sleep makes it worse.

Context tells you whether the speaker means symptoms, mood, pain, stress, or something else.

The strongest stress would usually fall on the important content words:

• Det blir VÄRre när jag inte SOver.

Function words like det, jag, and inte are usually less stressed unless you want contrast.

For example, if you want to emphasize the cause, you might stress inte more:

• Det blir värre när jag INTE sover.

That suggests a contrast, like not when I sleep, but when I don’t.

A rough breakdown is:

• Det = it
• blir = becomes / gets
• värre = worse
• när = when
• jag = I
• inte = not
• sover = sleep

So the structure is:

It gets worse when I do not sleep.

That is a very close match to the English structure, except for the Swedish rule that puts inte before the verb in the subordinate clause.