Minulta tuli mentyä nukkumaan liian myöhään, joten olen väsynyt.

It is an idiomatic Finnish way to say something like I ended up going, I happened to go, or I sort of went.

The important nuance is that the action is presented as a bit unplanned, unintended, or something that just happened on the speaker’s part. In this sentence, Minulta tuli mentyä nukkumaan liian myöhään suggests more than just a neutral fact; it sounds a little like I ended up going to bed too late.

Because this construction does not use a normal nominative subject.

In the pattern minulta tuli tehtyä / sanottua / mentyä, the person is marked with the ablative form:

• minulta = from me
• sinulta = from you
• häneltä = from him/her
• meiltä = from us

In ordinary Finnish, minulta often literally means from me, but in this structure it functions more like on my part / by me / I ended up.... It is best to learn this as a fixed grammar pattern rather than translating minulta literally every time.

Mentyä is a special verb form used in this construction. More specifically, it is the partitive singular of the passive past participle of mennä.

A useful comparison:

• tehdä → tehty → tehtyä
• mennä → menty → mentyä

In the pattern tuli tehtyä, Finnish uses this participle form, not the basic infinitive. That is why you get tuli mentyä, not tuli mennä.

If the grammar label feels too technical, the practical takeaway is simple: after tulla in this expression, Finnish uses forms like tehtyä, sanottua, unohdettua, mentyä.

The difference is mainly nuance.

• Menin nukkumaan liian myöhään = I went to bed too late.
  This is a straightforward statement of fact.

• Minulta tuli mentyä nukkumaan liian myöhään = I ended up going to bed too late.
  This sounds less direct and often suggests that it was not really planned, or that the speaker is mildly regretful, apologetic, or self-aware.

So tuli mentyä often has a feeling of oops, that happened.

Because after a verb of movement such as mennä, Finnish usually uses the third infinitive illative to express going to do something.

So:

• mennä nukkumaan = go to sleep / go to bed
• mennä syömään = go eat
• lähteä kävelemään = go walking
• juosta katsomaan = run to see

This form has an into doing idea. So nukkumaan is the correct form after mennä.

Because they do different jobs.

• mentyä belongs to the idiomatic construction tuli mentyä
• nukkumaan tells you what the speaker went to do

So the structure is basically:

Minulta tuli mentyä + nukkumaan + liian myöhään

In other words, I ended up going + to sleep + too late.

Because myöhään and myöhässä are not used in exactly the same way.

• myöhään = late, at a late time
• myöhässä = late, not on time / delayed

Here the idea is going to bed at too late an hour, so liian myöhään is correct.

Compare:

• Menin nukkumaan liian myöhään. = I went to bed too late.
• Olin myöhässä koulusta. = I was late for school.

Joten means so, therefore, or as a result.

It connects the two parts of the sentence:

• I ended up going to bed too late,
• so I am tired.

It is a very natural written and neutral spoken connector. In more casual speech, people might also use other ways of expressing the same idea, but joten is perfectly normal Finnish.

Because joten introduces a new clause, and in Finnish it is normal to separate that with a comma.

So:

• Minulta tuli mentyä nukkumaan liian myöhään, joten olen väsynyt.

That comma is standard punctuation.

Because the two clauses refer to different times.

• tuli mentyä refers to the earlier action: going to bed too late
• olen väsynyt refers to the present result: I am tired now

This works very much like English:

• I went to bed too late, so I am tired.

So the tense choice is completely natural.

Not a normal nominative subject like minä.

The first clause is an impersonal construction. The speaker is still understood to be the one involved, but that is shown by minulta, not by a regular subject pronoun.

In the second clause, Finnish also leaves out minä, because olen already makes it clear that the subject is I.

So Finnish does not need to say minä olen väsynyt here unless you want extra emphasis.

Yes. A simpler version would be:

Menin nukkumaan liian myöhään, joten olen väsynyt.

That is straightforward and very natural.

The original sentence is not wrong or strange at all; it just adds the nuance that the speaker ended up doing it, perhaps a bit unintentionally or against better judgment.

Yes, very common.

Some examples:

• Minulta tuli syötyä liikaa. = I ended up eating too much.
• Häneltä tuli sanottua jotain tyhmää. = He/She ended up saying something stupid.
• Meiltä tuli ostettua uusi auto. = We ended up buying a new car.
• Sinulta tuli unohdettua avaimet. = You ended up forgetting the keys.

This pattern is especially common when talking about:

• mistakes
• accidental actions
• unplanned actions
• things you did even though you maybe should not have

So learning this sentence helps with a very useful Finnish structure.