The concept is incredibly simple:
Before going to bed, you loosely wrap aluminum foil around your **door handle or knob**, especially on doors that lead outside or into shared spaces (like hotel hallways or apartment corridors).
If someone attempts to turn or touch the handle:
* The foil **crinkles loudly**
* It often **falls to the floor**
* The unexpected noise can **wake you up instantly**
That’s it. No wiring. No batteries. No apps.
Just foil.
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