White Noise — 12 Hours

White Noise for 12 hours is ideal for nursery coverage, all day apartment masking, continuous background. Twelve hours is maximum coverage - from afternoon through the night, or from morning through evening.

White noise contains equal energy across all audible frequencies — from the deepest bass to the highest treble. It sounds like TV static, a fan on high, or a rushing air vent. It's the broadest-spectrum masking sound available, which makes it the most effective at covering a wide range of environmental noise. White noise was the first type of noise studied for cognitive and sleep benefits, and the evidence is extensive though mixed — the Capezuti systematic review (2022) found only 33% of white noise studies showed clear positive sleep outcomes. The Nigg meta-analysis (2024) found white noise beneficial for ADHD cognition (g=0.249) but harmful for neurotypical adults (g=−0.212), suggesting it works for those who need external stimulation but overstimulates those who don't. Many listeners find white noise harsh for extended periods due to its prominent treble content. If white noise feels fatiguing, try pink or brown noise instead.

Twelve hours is maximum coverage - from afternoon through the night, or from morning through evening. This duration is most useful for environments that need continuous sound: nurseries (baby sleep + daytime nap coverage), home offices in noisy apartments, or shared living spaces where the sound creates a consistent acoustic environment all day.