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I started reading 君の名は and this sentence came up: そんな気分になったのは。。

(1) what does the なった means here? Is it the past tense of the verb なる which
means “to become”? What meaning does it have in this sentence?

(2) ~のは as ending, how does it work/what nuance does it give to the sentence?

EDIT: You can read more about Cleft Sentences at [The Family of Japanese no-wa
Cleft Construction: A Register-based
Analysis](https://digitalcommons.odu.edu/cgi/viewcontent.cgi?article=1029&context=worldlanguages_pubs)
and [ The grammar and discourse functions of Japanese cleft
sentences](https://japanese.stackexchange.com/posts/93930/edit). Hope this
helps!

[![enter image description
here](https://i.stack.imgur.com/FWkUm.jpg)](https://i.stack.imgur.com/FWkUm.jpg)
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grammar particle-は sentence cleft-sentences
~のは at the end of the sentence. What does it mean?
> (1) what does the なった means here?

気分 is "feeling, mood". According to the provided context そんな気分 is just
pointing to the feeling stated in the first sentence (my attempted translation
might not be accurate):

> 起きたら忘れてしまていて、でも何か... 欠けている
>
> I forgot it after waking up, but something is missing

Therefore, そんな気分 would be "The feeling of finding that something is missing".

I think you are correct than なった is the past verb to mean "became", and the
construction here is **A + に + なる** (where A is a noun or a na-adjective)
which means "to become A" :

> 寒くなった
>
> I got cold.

> きれいになった [She] became beautiful.

In your sentence, I understand it as though the speaker didn't have this
feeling initially, but at some point he got it.

> ~のは as ending, how does it work/what nuance does it give to the sentence?

I don't think that のは is meant to be a sentence ending construction. Note that
it is not the case that your sentence ends in a period:

> のは。

But instead, if we look at the context, it is followed by the ellipsis "...",
and after that by a "たぶん...":

> そんな気分になったのは **...** 、たぶん **...** [something implied or deferred as an
> ending]

which suggests that grammatically it should have an ending. the の is
nominalizing the predicate そん気分になった (please take a look to [this
Q&A](https://japanese.stackexchange.com/a/1347/32952) for more info on
nominalizing sentences with の) and the は is making the nominalized predicate
the topic of the _incomplete_ sentence:

> そんな気分になったのは... [something missing]
>
> Getting this feeling... [something missing]

There is a grammar construction **Aのは、Bからです** meaning "the reason for A is B":

> 寒くなった **のは** 窓が開いている **から** です
>
> The reason it has become cold is that the window is open.

Note that in this construction, the reason A is being emphasized by the use of
のは, so it sounds stronger than just:

> 窓が開いている **から** 寒くなった.

This is the grammar I guess is being used in your sentence. Maybe I am wrong
and のは is just emphazising the sentence as a subject without being linked to
the reasons for it.

All in all, my guess is that leaving そんな気分になったのは **...** 、たぶん **...** as an
incomplete sentence is a narrative tool, and that what comes after the
sentence is the exposition of the events or the facts that explain why the
speaker had such a feeling.

Somehow, if this was a movie or an anime, it would be the equivalent to a
narrator voice explaining something, and then changing the focus to a scene, a
dialog or a flashback where the narrator shuts up and the characters start
interacting. So all in all, I would understand it as:

> そんな気分になったのは... たぶん... [Events shown directly in the story]
>
> The reason why I got that feeling is, maybe... [Events shown directly in the
> story]
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answer
のは does not end the sentence, but the dot means some pause in the character's
narration. The full sentence continues そんな気分になったのは...たぶん...あの時から.

It is a cleft sentence, you can [search on this
SE](https://japanese.stackexchange.com/search?q=cleft%20) for other examples.
Roughly AのはB（である/です) corresponds to _It is B that A_. E.g. コロナが始まった **のは**
2020年からだ = **It is** since 2020 **that** the covid-19 started.

So the sentence translates as _It is ... maybe ... since then that I felt that
way_.

そんな気分 is, as explained well in jamanso7's answer, the mood described by the
preceding sentence. Xな気分になる generally means _to get the mood X_ , or _to
become X (e.g. sad)_ , or _to come to state of mind X_. Here in particular, it
is closer to _got such a feeling_ or _started to feel that way_.
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answer