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When a vacuum's sound changes, experts from Bosch and Hoover recommend checking for:

: Many users report that these sounds mimic the rhythmic, broad-frequency noises heard in the womb, which helps infants (especially those with colic) fall asleep faster .

(Vacuum Cleaner Sound) is primarily reviewed as a form of for sleep aid or as a technical performance metric for quiet vacuum models. 1. As a Sleep Aid (White Noise)