Understanding subject of narration


I am looking for some assistance in understanding in first person narration
when the narrator is speaking about themselves, or 'we'. Much of the time the
meaning is unambiguous from context, however when a statement appears
ambiguous (at least to me) it is not so clear.

To provide some context, the narrator works in a pub and has been serving and
it is nearly closing time.

> 楽しい時間が続き、一人、また一人と店をあとにする。
>
> ロブとエドが残り、おれと父親と四人になった。
>
> いつものメンバーだ。
>
> **エールのアルコールが体の隅々まで行き渡り、気怠い時間が流れる** 。

Now this final sentence does not make it clear who it is referring to, nor is
there an obvious specific person who has been drinking. Having said that, I
think it is just a statement with no one in particular in mind, but is there
something I am missing that makes this obvious to native speakers, or is there
always this sort of ambiguity for Japanese natives and they just unconsciously
assume one way or the other based on the previous context?

I mean in this context, the possibilities are an 'I' however this does not
really fit in with the tone of the rest of the sentence (気怠い時間が流れる), which
leads me to a more generic interpretation referring to the people who have
drank.




No subject is dropped in the sentence in question, and there is no Japanese-
specific ambiguity in this sentence. Its interpretation purely depends on who
has been drinking in this scene. I can say it's not directly specified in your
excerpt, but it may be explained in previous sentences. We all know an
employee of a pub _usually_ doesn't drink together with customers, but there
can be exceptions. If you are certain that there is no hint as to who has been
drinking, perhaps the sentence was written with no one in particular in mind.

