### 4. It’s Especially Effective in Quiet Environments
This trick shines in places like:
* Apartments
* Hotel rooms
* Dorms
* Guest houses
* Cabins
* Short-term rentals
These environments tend to be:
* Quiet at night
* Close-quarters
* Easy to hear sudden noises
In contrast, a loud foil crinkle might be less noticeable in a busy household with fans, TVs, or street noise—but even then, it still adds a layer of alertness.
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