Mér finnst eðlilegt að vera þreytt eftir langa viku, en það væri skrýtið að sofa á fundinum.

Because finnast does not work like a normal verb with ég as the subject. In this pattern, the person who has the impression goes in the dative case, so mér means to me.

So Mér finnst eðlilegt... is literally something like To me, it seems natural... or more naturally I find it natural...

Finnst is the present-tense form of finnast. In sentences like this, it often means to seem, to feel, or to find in the sense of having an opinion or impression.

So Mér finnst eðlilegt... means something like:

• I find it natural...
• It seems natural to me...
• I think it’s natural...

It is often softer and more personal than a more direct opinion verb.

They are neuter singular because they are describing a whole idea or action, not a specific masculine or feminine noun.

In Icelandic, when an adjective comments on a clause such as að vera þreytt... or að sofa á fundinum, the adjective is very often put in the neuter singular:

• eðlilegt = natural
• skrýtið = strange

This is similar to English it is natural / it would be strange, where it does not refer to a real object.

Væri is the past subjunctive form of vera and is commonly used to express something hypothetical, which English often translates with would be.

So:

• það er skrýtið = it is strange
• það væri skrýtið = it would be strange

Here the speaker is making a more hypothetical judgment: being tired is normal, but sleeping during the meeting would be strange.

Because að marks the infinitive, like English to.

So:

• að vera = to be
• að sofa = to sleep

After adjectives like eðlilegt and skrýtið, Icelandic commonly uses að + infinitive to say what is natural, strange, good, difficult, and so on.

Here þreytt is being used in a general, non-specific way. The sentence is talking about the idea of being tired after a long week, not clearly identifying a particular man or woman inside the infinitive phrase.

In that kind of general statement, Icelandic often uses the default/gender-neutral-looking form, which here is þreytt.

If you wanted to make the person more specific, you could get forms like:

• að vera þreyttur for a male person
• að vera þreytt for a female person

So the form in your sentence helps keep the statement general.

Because eftir here means after in a time sense, and in this use it takes the accusative.

So:

• vika = week
• accusative singular = viku
• löng becomes langa in the feminine accusative singular

That gives eftir langa viku = after a long week.

Because á can take different cases, and here it shows location/state, so it takes the dative.

• fundur = meeting
• dative singular definite = fundinum

So á fundinum means at the meeting / in the meeting.

If there were motion toward something, Icelandic would often use a different case, but here the person is already there, sleeping during the meeting.

No. Á fundi or á fundinum is an idiomatic way to say at a meeting.

So að sofa á fundinum means to sleep during the meeting or to fall asleep at the meeting, not physically on top of anything.

It is a dummy subject, just like English it in it would be strange. It does not refer to a concrete thing.

Icelandic often uses það + vera + adjective + að-clause:

• Það er gott að hvíla sig. = It is good to rest.
• Það væri skrýtið að sofa á fundinum. = It would be strange to sleep at the meeting.

In the first half of your sentence, Icelandic can simply say Mér finnst eðlilegt að... without needing that extra það.