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眠ってしまう

fall asleep; end up falling asleep

→ 眠る
phrase Rare #41,405
fall asleep; end up falling asleep The auxiliary しまう emphasizes that the action is completed, often unintentionally or with regret. Depending on context, 眠ってしまう can mean “end up falling asleep.”
JA: いつも本を読んでいるうちに眠ってしまう。
EN: I always end up falling asleep while reading a book.

いろいろ問題が昼間も眠ってしまうなぜなら…その身振りが何を指すのか見当もつかない

There are all sorts of problems, and I end up falling asleep during the day because… I have no idea what that gesture is supposed to mean.

— どん底作家の人生に幸あれ! (2019)

いつも本を読んでいるうちに眠ってしまう。

I always fall asleep while reading a book.

まさか朝まで眠ってしまうとは

I can't believe I slept until morning.

— サイコ (1960)

それとも、眠ってしまうようなものかな。

Or maybe something that puts you to sleep.