Psychology Explains Why People Feel Safer With Foil Under the Bed

At first glance, putting aluminum foil under the bed sounds irrational. There is no scientific evidence that a thin sheet of metal can block bad dreams, negative energy, or invisible threats during sleep. And yet, many people who try it report something interesting: they feel calmer, safer, and sleep better.

Psychology offers a clear explanation for why this happens—and it has very little to do with aluminum foil itself.