Time Window (During / While It Lasts)

3 related grammar points that express the same core idea - compared below so you can tell which one to reach for.

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Noun の間に JLPT N4
Verb ている間に JLPT N4
～うちに JLPT N3

の間に / ている間に

The window is defined by something going on, not by a named period.

Verb ている間に vs Noun の間に: Use ている間に: 寝ている間に. の間に needs a noun for the period (休みの間に). Same 間に, and the only question is whether what bounds the window is a stretch of time or an ongoing action.